I'm a professional longarm quilter but that does not mean I'm perfect. I look at mistakes as a learning process. Many of the quilts I receive are from new quilters and I have seen some things but most of the little things quilt out or there are ajustments I can do to help. The main thing for me that is a problem is when seams come unstitched. These are usually found after I have the quilt on the frame - these are hard to fix and some times impossible. I do make gentle suggestions to the quilter or it I see a problem. (Like seams are different widths - some 1/4" some 1/2" and when they use fabric that cause a problem (mixing upholestry fabric with nice quilting fabric - may not wash so well) Also, I try to tell them quilting is a work of art not a work of perfection.