You can’t have it both ways.
Either you are concerned about the big picture, or you are concerned about the little tiny details. Or, you could be focused somewhere in between.
The point is, you can only focus on one thing at a time. Either you’re trying to play that note correctly, or you’re trying to make music.
When you practice, you have to pick just one thing to work on. And, when you perform, same thing.
If you perform, and you’re trying to make music, try to make music. When you finish, if you notice that you made tons of mistakes, don’t say “I shouldn’t have made those mistakes.”
Of course you should have.
So, go back to the practice room. Pick one of those mistakes, and focus on it.
This is how you take control of the present moment. It’s not by trying to change the past into what it “should have been.”
I want to know what you think about this. Do you find it useful to focus on just one thing at a time? Or, is it more helpful to hold yourself responsible for more?