As the others have said, instructor and club. Also, check all the control surfaces. Make sure you have a smooth and not binding
travel on the throttle servo and linkage. Also check the rx and do a full range check. Check all the landing gear screws and make sure they are tight and lastly, check the engine mount and engine (make sure all screws etc. are tight.)
You will see that glow engine aircraft are much more different than electrics. Especially if your used to park flyers and planes in the
speed 550 and below category. Glow engine aircraft move much faster and things happen quickly. Maybe flying it won't tax you on your skills as an rc pilot but if you not used to landing with landing gear, that will probably be the toughest challenge.

Dave...