The best way to get something done is to begin meaning. Procrastination is the enemy of success, and will prevent you from accomplishing anything at all. Even the longest journey starts with a single step, something small and insignificant can be the start of a better future whether you realize it at the time or not. If you want to get something done then you have to take the first step in order to make progress and move forward towards your goals. If this doesn't happen then everything will stop and become stagnant, preventing you from making any progress.
Sometimes starting something can be the most difficult step because this is also the hardest. Once you begin then momentum will often continue to carry you forward, but you have to start in order to build up this momentum in the first place. You will never finish anything unless you start it first, and the only way to do this is to begin. Don't think about it too long or too hard, be like Nike and just do it. Don't let procrastination stop you from being the best you that you can be.