I think we tend to be too critical of ourselves. Do up a sample and throw it in the washer/dryer. Check it again after it crinkles up and you probably won't notice as many problem areas as you did when you first quilted it. When I do something I think needs to be fixed, I mark that area with a large safety pin. If I can pick out the mistake easily, I might rip it out. If I have trouble finding it again, I leave it. Until you are more satisfied with your work, blend the thread color rather than contrasting it. If you are quilting straight lines rather than FMQ, use a walking foot. A supreme slider helps move it along when doing FMQ. Gloves help with either. I've tried various gloves and found that I like the Machingers the best.
Practice before you start on the quilt and if you take long breaks, it doesn't hurt to practice some more. You'll get there!