I have made many mistakes, but have both of my eyebrows (currently at least), both of my eyes (thank you safety glasses) and all of my fingers. My nearest vehicular maintenance miss involved some cheap spring-compressors on a suspension upgrade for one of my 300ZX's. They were adequate for one job, and I think I realized that at the time, so away they went.
I have been in a few situations where my hands were too big, ready to burn the whole project to the ground, so I have called my better half to, as I call it, "Fizzwizzle-it" and she does. Amazes me every time when I was about to get the BFH out and go to town. Those darn parts just shouldn't fit in that space dammit!
So, instead of beating up the current project, I have learned to take a step back, go for a run, hit the weights, hit a heavy bag, kick the dog I don't have, anything to relieve the frustration on anything other than what I am working on...unless it is a stuck bolt, then I unleash hell on it. Chances are someone on the internet has had the same problem and has a video posted on how to get around it. You just gotta find it out there on the interweb.