In order to make good letter forms, we must train our hand, eye, and mind to work together. Making letters with a pencil (aka Pencil Skeletons) is a good way to practice the shape and proportions of the letter. The skeleton is supposed to be juggling a hand, eye, and a brain.
From other people who have taken a class with Reggie, I heard the phrase, "You're not old enough." when a question is asked before Reggie has gotten to that point in the lesson. I thought it was just a myth, but he really says it.
Don't use hot water to rinse or wash your paint brushes. And, the eye is the arbiter of what is good.