I have been quilting about 18 months. Initially I would become very frustrated when I had to redo something that I had pieced and would find that I became anxious and did not enjoy what I was doing! After a few talks with myself, I decided to make the seam ripper my friend! Now, if I need to remove a seam or something I find that I am more exacting and do a better job, consequently less rippin out as well - It is amazing how you can turn a negative into something positive. Just don't be so hard on yourself, rather, note the improvements that you make as you go along!!