chopperguy-
this mustang is pretty easy to fly, as long as it is balanced correctly (per the hangar 9 instructions). but if you are concerned at all it would be a good idea to have an experienced warbird pilot help you fly it the first time to get it trimmed properly. but if you have flown for several years this plane will not be a challenge.
the gear should be set so the axles are even with the wing leading edge when the plane is level, which minimizes the nose over thing. then only a little up elevator is needed. be careful to release the up el;evator as the plane reaches flying speed, or it may tend to try to take off at a steep angle and may tend to stall. however mine with a good running saito 100 and apc 14-8 would not stall easily, but it would tend to get your heart beating

.
my concern is it flies a little slow with the saito 100/apc 14-8 prop, but then i have a number of warbirds and like those strafing runs

. so i will try a higher pitch prop if the snow ever melts here in ohio.
of course you want to take it up a ways and test the stall up where you have the height to recover, so you get to know how it handles at low speeds. if it drops a wing much it is out of balance- mine DOES NOT snap. you may want to balance it side to side also.
i would change to 1/4 inch nylon wing bolts, but this depends on whether you are confident that the steel bolts will not vibrate loose. the nylone bolts will tend to stay tight better.
just my 2 cents worth. good luck- this plane will be fun to fly just use a little care getting to know it and after flying some you will have a lot of fun with it.
ed