I do the best I can and don't stress over it if it's not perfect. I do unravel crochet and rip out knitting if I find an error even if it's rows back. No one else might see it but it bothers me because I know it's there. I have a wall hanging that has a horrible error on it that I didn't even see until it was up on the wall. I hate it now and I will do another one the right way! There are some things that are never going to line up but I will make every effort to do it right.