RE: Great Planes Extra 300 40 Size
Just because you can fly an Extra does not mean that you have nothing to learn.
The principal problem people have moving up to more advanced models is pattern work. Take-offs, and flying a down wind leg, base leg, and final approach without stalling in a turn or collapsing the landing gear on the first bounce called landing.
Too many people can only land from one direction, or roll one way. Clearly they need more practice. Do you line up with the runway or does the wind decide your direction?
Walk up and down the line of pilots when they fly at your local field. How many are using both sticks on the transmitter? Far too many pilots treat the throttle as an on/off switch, and rudder for steering on the ground only.
Ask youself, could you do 100 take-offs and landings with your current model without breaking a wood prop? Simple task, like shooting free throws if you are a point guard.