if you can dismantle and assemble your trainer blindfolded, if you manage to do all the maneuvers a trainer can do and you think you can do better. then you might have mastered it already.

I've very recently seen expert pilots do some things with my Avistar that I can't do yet, My first two planes were high wing electrics. (J-3 and Super Cub)
When I got to the point I could fly all the basic manuevers these planes are capable of and landsuccessfully anywhere I wanted (within the plane's limits) I moved up to my third plane, which was a low wing (T-28). WhenI moved up to glow engines, I followed the samepattern. Started with an Avistar and moved up from there.If you can fly your glow engine trainer in 10mph winds,fly the pattern inverted, and land safely and consistently, you still have not mastered it, but you are probably ready foryour next plane.