The terror would begin each morning in the shower. My brain was like a six-lane expressway — a never-ending high-speed stream of anxiety: Did I book every trade last night? Did I make any trading errors? Is today the day I'm going to be let go?

"Each day expect to be fired. If you're not, then you've had a good day" — that's one of the most important things I learned as a trader on Wall Street.