Despite battling ferocious personal demons and alienating just about everyone, Bobby Knight won more basketball games than anyone in NCAA history. So I pay attention when he says "I have never allowed myself to dwell on games we won. I've always felt winning is what you're supposed to do. Winning is a by-product of preparation and work at practice, all the things leading up to a game."
To me, this is applicable to the cello, at all levels. When you practice a shift, the goal should be identifying and solidifying the entire apparatus necessary to coordinate the perfect combination of motions, not simply hitting the note. You can do everything wrong and still hit the note by luck, but you will certainly miss it the next time. If you focus on your career instead of focusing on being totally ready when you step out on stage, eventually all the networking and publicity will avail you nothing.
Getting good is a matter of noticing and learning from smaller and smaller mistakes.
I talked to the guy a couple of times at IU, and he was stand-offish but polite. Wish they could figure out how to bottle and sell his good qualities.