I learned, a lonnnnnng time ago, that striving for "perfection" means never getting anything done. I'd sew, see a crooked stitch, rip, etc. Drove myself crazy! Nowadays, I just enjoy what I'm doing and if something is crooked, I decide whether or not it's crooked ENOUGH, to be ripped. In most cases, it isn't.
Unless you're planning to enter the quilt in a contest, just ENJOY the experience!