I can relate to feeling enraged grocery-shopping! Large crowds cause me unimaginable irritation.
Something "simple" I find difficult is personal grooming-especially if the goal is to not knock everything off the counters and look like a kid whose just finger-painted. Makeup, I can somewhat do. It may take a long time and more makeup may end up upon my appendages than my face, but it turns out alright. Hair, however, is impossible. My fumbley-fingers simply won't cooperate. I am practicing using a straightener and so far, it is rather difficult. I think being able to do things like that would make me feel more adult.