I understand what you're going through. I just finished the back of a sweater, and if I hadn't had to rip out part of it twice and reknit, I probably would have both fronts done by now. I'm such a perfectionist though, even though someone else may not notice a mistake in my knitting, I would notice it!
A couple of tips for you about things like sleeves--
I do like to do them at the same time, but that's not always feasible for me, so I take lots of notes about which rows I did increases on, stitch counts etc., and
If you end up with the sleeves being a bit uneven tension wise, unless it's really drastic, you might try blocking them before frogging next time. Sometimes that will even up the tension nicely.
Can't wait to see the FO!