When I train leaders I often ask, "how come winning teams lose and losing teams can win? I get many responses to this question, but I conclude by letting participants know that past success does not account for future glory. It doesn't matter how many games you have won or lost, the only things that count are courage, character, competence and the nature of the challenge.
A teenager called David killed the giant Goliath, a seasoned soldier, in his first war. The size of the challenge may have been new to David, but certainly not its nature. David killed Goliath with the same skills he used to kill lions and bears while looking after his father's sheep. The size of the challenge was new but the nature of the challenge was exactly the same.
When you face a challenge, don't look at its size. Study its nature, if it is something you have handled before. It really doesn't matter how large the challenge is, you have the skill to smite it. Past success does not account for future glory, but accumulated skills do.