perhaps you're too afraid to loose your precious hand built 4*40?

Get a cheap low wing ARF, like the World Models Mach 2 wich retails fro $69:-.
Slap it together fast with no feelings attached and tell yourself that you can afford to loose it!
Ding it up a bit on purpose and make sloppy repairs with packing tape to further loose any attachments to it.
Now go out and fly the !"%¤%** out of it and try all those manouvers that you know how to do in the sim but chicken out to do on the 4*40