I had an instructor tell me she paid $200 for a class to learn how to do this on her own..and she taught it to us, but I'll tell ya, if you don't pay attention to what you are doing, (and I never seem to be all there) you can screw it up. This tool is just the ticket. I just have to remember how to use all these gadgets, and there are MANY of them. Saw the curved foot, and I am a GO on that gizzy too..Joanie