You don't need to be great at what you do; you just need to be the one person who actually decides to do it. Non-action out of Fear seems to be a collective habit of the human race. If you decide that you are eager to learn and hence are willing to take action there is a fair chance you will succeed. So please answer the question whenever you are procrastinating: 'What are you waiting for?'
If Fear holds you back and there is no good reason not to do it also consider the cost of your non-action. Suppose you like someone but you are afraid to ask that person to have a drink with you. Where will you be one year from now if you do not take your responsibility?
If you find yourself procrastinating perform this exercise. The more you apply the exercise the better you get at it and very soon you will be reaping all the benefits of being proactive. You are the life creating force.