Your ability to select your most important task at each moment, and then to get started on that task and to get it done both quickly and well, will probably have more of an impact on your success than any other quality or skill you can develop.
Your success in life and work will be determined by the kinds of habits that you develop over time. The habit of setting priorities, overcoming procrastination, and getting on with your most important task is a mental and physical skill. As such, this habit is learnable through practice and repetition, over and over again, until it locks into your subsconscious mind and becomes a permanent part of your behaviour.