Back when I was just a kid working for GE as a field engineer; our managment told us that safety was first, last and only. One of my fellow trainees almost got himself fired during training class for working unsafe. If we were getting hassled to the point of being distracted or unable to continue our work safely, we were authorized to pick up our stuff and leave the jobsite. Period. And our managers would actually take OUR side when the customer called in all p***ed off. I'm glad that I had such a safety conscious boss when I was starting out.
It's many years later and I still work that way; the more you make me nervous...the slower and more deliberately I work. There's no point in MY getting hurt just so that some other poor soul can fill in for me and get hurt because of the same 'Nervous Nellie' who just can't stand that his machine isn't working at maximum efficiency at that precise second.
I once saw a poster with the cartoon character Maxine on it that I wish I had bought for my wall..."In a hundred years it won't matter; HELL, it hardly matters NOW".