Sounds like you are trying to follow too many rules. Just the basic accurate cutting and 1/4 inch seams are important. Anything else is just personal preference. Also, remember that there are several ways to accomplish the same thing. Maybe you need to just try tying a quilt instead of quilting it. This way you can piece one and complete it without getting too stressed out over the quilting aspect. Take it one step at a time and remember, this is a hobby. You need to relax and enjoy the process. Mistakes are just design opportunities.