I expect some mistakes and I don't beat myself up over them, but I do try to analyze how/why they happen so that I can avoid those things in the future. The biggest one for me is losing concentration. If I'm annoyed with someone else on stage who's dragging the tempo or something, I might lose focus and that's when the clams come tumbling out. So I try not to let anything during a performance pull me out of my zone. Not saying I'm always successful but it's something I strive for.
Other than that, it really is a matter of practicing enough that you really know the material well. Mistakes will still likely happen, but you can keep them to a minimum. Just keep playing
Other than that, it really is a matter of practicing enough that you really know the material well. Mistakes will still likely happen, but you can keep them to a minimum. Just keep playing