I haven't actually had bad quilting advice, just a bad experience with my first and only quilt class. I've sewn all my life and knew I wanted to quilt when I retired. So I waited six months for a class, but in the meantime I decided to get a book and make a baby quilt. It turned out great! The class was awful though. I was not allowed to use my 1/4" foot because "the rest of the class doesn't have one". While I brought my own machine to class, most of the others did not have their own machines and much time was spent on teaching various people how to sew on various machines. I went to three classes and then decided I'd do better on my own. A friend invited me to join a quilt quild. Imagine my surprise when the president happened to be that teacher! LOL!