I'd say I'm moderately well experienced with panthers, having had quite a few over ten years, including breeding. However, I've also happily had very few issues / illnesses to deal with, so I'm NOT experienced in dealing with MBD, URI, etc since I've not encountered these things directly. By the same token, I'm not whatsoever experienced with vields or any other chameleon, having only ever read about them. I am quite sure there is a difference between being well read on a topic and being directly experienced.
Kinda like Julirs comment. Reading about how to drive doesnt mean you wont stall and grind the gears when you first learn clutch standard. I also think keeping a chameleon for two years isnt really enough to call yourself experienced. Im sure there are people inadvertantly doing a poor job of keeping their chameleon, but it manages to live two or three years (instead of 7 or 8 years) anyways. Heck my first chameleon lived to be 7+ and I know for sure I didnt always do everything right, especially in the beginning. I'm still learning! I will gain experience, but will never consider myself an expert.