By trying new things and taking the risk to stretch your present level of ability, you discover that trying is the key [to confidence].
If you do something well, five thousand times, you know you can do it; therefore, you are confident. If you have never done it before, you don't KNOW.
Self-confidence is nothing more than knowledge...To be self-confident, all you need is information.
You've got to be sure of yourself before you can ever win a prize.