I was in a class recently taught by a pro and she was surprised (critical?) of the way I cut, couldn't figure out what the problem was, still can't. Maybe that's what comes from being self taught. I had to put off the beginning class I was signed up for because my machine is in for a tune up, I have a feeling I'm doing lots of stuff wrong that generally works for me. I need to have a humble, open mind and not take it personally if have some bad habits.