There are a lot of great suggestions here. I can only add that I've been where you are and it is totally frustrating! Relax! I finally gave myself permission to just do the best I can today and try for better tomorrow. Everything I ever made has mistakes, and I always finish a project knowing that if I make it again, I could do it better because I have found little things while working on it that would help next time. My quilting motto is "Better finished than perfect." I was almost paralyzed by the need for perfection. Each project is a little better than the last and that is all I ask for.