Me? I never mess up!
I crackled the guitar in my tutorial 3 times before I got it right....
I stop, have a smoke, contemplate how p.o.'d I am, and if I'm still in good spirits I go back at it and try again. If not I find a distraction for an hour or two then try again. I get less upset the older I get. if I was doing this when I was 20 I would have had a lot of flying guitars!