the only thing I can add in my own quilting world is I (try) to always measure twice, three times, four times- as many times as it takes to figure out I have it right before I cut- so I don't wind up with messed up measurements. it took me years to figure out how to keep things from growing out of control...now I sketch my design out on graph paper and figure out the sizes before I dive into my fabrics. I also strive to learn new techniques, try new things as often as possible....but asking about 'rules' is like asking Picasso the rules of painting...do what feels right TO YOU and don't worry about whether or not others see YOUR VISION.