how can i learn to fly the trex sa? simulator?

yes, a sim is probably the 2nd best way to learn to fly, and the cheapest. the best way but more expensive would be just flying. their is no substitute for the real thing, but sims can get very close.

the mx 400 on the real flight add on pack is identical to the trex 450 almost. i flew all summer on that simulator and i recently flew my trex 450 se and i did just fine except for the setup. if you read my other thread youll see what happened.