Michael Cawley has enjoyed a stellar career. In this article, he shares his five favourite lessons in leadership.Over the past four decades, I have encountered some very impressive leaders in my professional life. From Coopers & Lybrand, where I trained to qualify as a Chartered Accountant, to Ryanair, where I worked as Deputy Chief Executive, I have seen many different types of successful leadership.However, the best leaders have all had several traits and characteristics in common. In this article, I discuss the five things great leaders do consistently. The best part about these five tips is that they are all doable with some thought and a little effort. There’s no magic and no secret sauce, but great leadership does require purposeful application.Present a clear missionBusiness isn’t rocket science but all too often, simple things become unnecessarily complicated. It is the job of the leader to simplify wherever possible, by establishing straightforward reporting lines and setting clear objectives. In doing so, your team will be better able to see their impact on the overall mission of the business. This is important as colleagues who can directly relate their efforts to business outcomes will ultimately raise their game to go above and beyond what is required of them. If you have a team of people working on this basis, the sky is the limit.It all begins with clarity, however, and that begins at the top of the organisation. An organisation’s leaders must understand the mission and communicate unambiguously to everyone – no fudge, equivocation or misunderstanding. Joe Schmidt often speaks about how great teams exceed the potential of their constituent parts, and the same applies in business. Be clear about what is required, get everyone pulling in the same direction, and your business’s performance will dramatically improve.Think beyond the possibleIn my view, we all achieve a small percentage of our potential, but good leaders help people see beyond the constraints and what they define as ‘possible’. As an example, in Ryanair we faced a seemingly insoluble issue in Italy some years ago. The airline’s schedule requires that the turnaround time at each airport for each aircraft is 25 minutes. To achieve this, Ryanair needs to refuel the aircraft while passengers disembark and baggage is removed. However, in Italy, uniquely in Europe, the law prevented airlines from fuelling the aircraft as passengers disembarked. Our punctuality in Italy was badly affected by this restriction and when every other option was exhausted, my colleague, the Director of Operations, was charged with the seemingly impossible task of getting the legislation changed.Initially, we all thought this was impossible but faced with no alternative, we developed an innovative strategy which convinced the Italian government of the merits of our case. This involved working at both local and national level at speed throughout Italy.This ability to challenge people so that they tackle issues that appear to be beyond them, but not so far beyond them to put them into a state of despair, is a delicate act – but if done right, can make the seemingly impossible, achievable.Develop self-confidenceLeadership can be a lonely place, particularly when you are the CEO. All leaders therefore need the self-confidence to see them through – not only during the tough times, but also day-to-day. Unfortunately, Irish people tend to harbour a high degree of self-doubt and this can lead to paralysis at the very moment decisiveness and action is required. But how can you build self-confidence as a seasoned professional? Success breeds confidence, and I am a big believer in excellence in basic execution. Too many people give up early – they hit a bump in the road and the journey ends there and then. Some people are also just waiting for you to fail. But if you obsess over the basics and execute brilliantly every single time, your chance of success will increase exponentially – and every little win will add to your confidence and self-belief.You also need to develop a relentless streak, because sometimes even excellent execution will not cut it the first or second time around. Michael O’Leary is a good example of this approach with his unwavering persistence and focus on the end goal. So, begin with the basics, execute brilliantly, and do not give up.Be paranoidTo become, and remain, successful in business, you cannot rest on your laurels. Andrew Grove, the founder of Intel who is famously quoted as saying “only the paranoid survive”, insisted that Intel double the capacity of their microchip every two years in order to stay ahead of the competition. He saw this as key to remaining number one in their sector.The truth is, once you or your business become a success, people are out to get you. Your competitors work night and day to catch up with you, so you need to work even harder to stay ahead. This paranoia isn’t the debilitating kind, however. It drives you to become better and see evolution and change as standard practice.Ryanair floated in 1997, and our grand finale on the investor roadshow was in New York. At the time, we could produce a seat for a fraction of the cost of our nearest competitor and investors jumped on the opportunity. The offering was 19 times oversubscribed but instead of thinking we’d made it, we knew that we had to continue to work hard to keep driving our costs down. Today, a number of airlines have a similar cost base to what Ryanair had in 1997, but we have moved on because we knew we had to. We still have the lowest cost base in Europe by far, which is the key competitive advantage when you are in the short-haul air travel business. This type of paranoia is driven by the realisation that, because you are a success, you inevitably become a target for your competitors and you must be at least one step ahead at all times.Booking.com is another prime example of this phenomenon. The company is valued at $70 billion and run by a formidable bunch of people. Every year, they make up to 10,000 changes to their website – most of which are so minute as to be virtually undetectable. But they continuously work to test and iterate based on what customers respond to – and in that way stay ahead of the competition.It’s all very well being paranoid, but how do you stay ahead as an individual? You must learn continuously and be acutely aware of the fact that you do not have a monopoly on wisdom. I am 66 years of age and I am still conscious of my shortcomings. To overcome them, I read and research continuously.Energy and enthusiasmAs a leader, you set the tone – and this is most apparent when it comes to your energy and enthusiasm. Your colleagues at all levels of the organisation will pick up on everything from the urgency with which issues are dealt with and the speed of your commitments to your body language and your choices. Energy and enthusiasm flow downhill, as does lethargy and tardiness, so you need to ensure that, as a leader, you are sending the right signals to your people. And although it may be more challenging to do in a remote working environment, it’s still possible if you adapt.The best time to test for energy and enthusiasm is at the hiring stage. Employ people with as much, if not more, enthusiasm than you. Look for people with integrity and honesty, who seek to say and do the right thing even when it isn’t what you want to hear.No amount of talent can make up for a poor attitude, so be careful in your hiring processes and set the bar high in your day-to-day work environment.Michael Cawley FCA is an independent non-executive director and former Deputy Chief Executive Officer at Ryanair.