The game was easy for me as a kid. I had to play a while to find out how hard it is.
Visualization. It may be the most important part of your mental package.
If I play my best, I can win anywhere in the world against anybody.
I honestly believe that with a strong mind, you can literally 'will' the ball into the hole.
When you're the best, and you know you're the best, and your contemporaries know you're the best, that's a terrific edge.
I was from North Carolina, so as a youngster all of my mind games about golf were always, If I make this I win The Masters, if I hole this par putt I win The Masters. So it was a great thrill to play there.