So, I'm making my first Fair Isle piece, a simple little beret with a fairly easy pattern. Yesterday, I decided that I was going to finish it (because I've just got too many pieces on the needles, and it was making my psychic skin itch). Sure enough, by the end of the day, I had decided to frog back to the first few inches. I'd learned enough about Fair Isle by last night and how relaxed you have to carry the yarn across the back, and the first bits where I'd gotten it too tight were really bugging me. I knew that if I left it like that, it would mean that I would enjoy wearing the hat a lot less.
My partner just smiled and shook his head, and his sister thinks I'm way too OCD!
How fussy are you about small mistakes, things that other people look at and say, "what mistake?" or some such? When is it worth it to you to frog or tink back, and when is it not? Does the thought of wearing or giving something with a mistake in it give you a mental rash, or do you not really care?