Practice and Performance
When it comes to performing, I am of the belief that you prepare (practice), and then you go out there and go for it. If it works, great; if you crash, hopefully you recovered. Either way, you accept it as was you've got at that moment, and when the moment's over, it's time to start thinking about the next one. I play around town quite a bit, and adopting this philosophy has really helped me to avoid spending useless time analyzing what when wrong on any particular gig.
I play a steady gig with several volunteer musicians, and as soon as the last song has finished, everyone is chirping about who screwed up and why. It seems very amateurish to do that.
Last night Yacht Rock had alot of finger pointing after the show at the 10 High. Things got a little tense. Let it go.