Remember your six P's - Perfect Practice Prevents Piss Poor Performance.
Winners bring reality up to their vision. Losers bring their vision down to reality.
Football players win football games.
Always have a plan and believe in it. I tell my coaches not to compromise. Nothing good happens by accident. There must be a plan for everything and the plan will prevent you from overlooking little things. By having that plan, you'll be secure and self-doubts will never become a factor.
If you could have won, you should have.
Winning and losing are both very temporary things. Having done one or the other, you move ahead. Gloating over a victory or sulking over a loss is a good way to stand still.