Many people teach agility classes as well as train their dogs to do agility.
It's not uncommon that instructors who are horrified at the thought of training a dog without positive reinforcement never have a word of praise for their human students. Taking classes really helps one gain perspective on what things are like from the student's point of view, and is highly recommended for all instructors. If you have a co-instructor, have him or her teach the class, while you attend as the student. You may notice a disturbing trend. Most dogs would just quit on you.