My PT has earned his very high hourly rate over and over again by teaching me about form and not allowing me to go too high in weights. I am one of those people who would be lifting 300lbs by now with all sorts of bad form if not for his watchful eye. I don't laugh at people like the one I saw because I know that I have enough ego to go there myself without some help.
My friend and I were discussing this recently and how some of these girls are lifting really heavy and how I am not permitted to lift to my max yet for 1 rep. Form before weight...
Espi, let go the ego and go ahead and be a trainer already.
If you continue to wait until you are perfect then it will never happen. The unfortunate thing about learning is that the more you learn, the more fault you see with yourself even though in reality you are improving.