First give your self permission to makes mistakes. We all do it in order to learn. I've been sewing all my life, quilting seriously for the last 10 years. I even teach quilting classes. BUT the last quilt top I just finished I unsewed three rows. I did not audtion the sashing. It made my beautiful feed sack blocks disappear. I always tell my students to audtion, audtion, audtion. I didn't listen to my teacher self.