Self certifying makes sense some times. I dine Nitrox almost exclusively, I am a certified blender, O2 clean certified. I have spent many hours studying the details and history of enriched air diving, I think that is enough for me to be able to teach a rec level EANx course. I am certified by 6 manufacturers to service regs and other gear, I have copious dive experience, many times performing on site fixes to enable the dive to continue.. I believe I can teach a rec level EQPT specialty. I am a snapshot UW digital photog. I don't feel that I am able to teach a newbie how to effectively take good UW pics.. I am out on that one.. Guessing that taking a class with a CD still won't make me a good UW photog.