I had to trim my own bangs for the first time after a haircut at the hairdresser‘s 5 weeks ago. As a complete newbie, I think I found the right technique and felt okay-ish while doing it, but then started feeling anxious as I noticed a minor lacks of symmetry. It escalated on me spending my whole evening in front of the mirror, comparing it to before-pics and wishing I could undo it. 
It‘s superficial I know, I guess I just have the tendency to discredit and second guess everything I do. Almost sure I‘ll be worrying about it on a daily basis now, or at least until I find something just as irrelevant to be obsessing over...