I can tell you, unless you are giving your quilts away to other quilters, the mistakes won't be noticed. I just recently started machine quilting. This was a big step for me, as i was in the same funk you are in. But I needed to finish a quilt for a family member diagnosed with cancer. His excitement over the gift was so overwhelming that I was encouraged to finish another one, and so on. I still have reservations but I trudge through as I know the recipient will love it anyway. Keep practicing, I still make mistakes, but I practice with each new quilt.