hmmm...

first the qhor (from the pictures from SPAD) isn't really a low wing trainer. it has no dihedral and is really mid wing since there is really no fuse and a traildragger at that! so the qhor is already much more advanced than say a strict trainer. the only thing about canadian's qualifications is how well he lands... a spad is great for beginners not because they are necessarily easy to fly, but rather because they are cheap yet robust and easy to repair. so if you are greasing the landings, i'm sure you'll be off the buddy box in no time.

as people mentioned, the only thing that may shock you is the speed. judging from the qhor wing design, it isn't meant to fly fast. the harvard will fly fast so when you're flying you need to take it easy at first with low rates and conservative throttle. second it's a trike... so it will have much better ground handling. so while you're spad may handle like a bus on the ground, the harvard will be more like a ferrari. don't put too much rudder or else you're bound to tip over. once the nose hits the ground, the nose wheel will be very effective. on the contrary take off's will be much easier and you'll particularly enjoy the trike on windy days when your friends are ground looping like their down their own version of swan lake.

however, i do agree with piper chuck. we've heard people wanted to learn by themselves on a HOB P-51. i think it is our responsibility as experienced people to warn those people of what may happen, the best of which is a damaged plane.