I actually find the canter on such a large horse easier to sit than the trot. Especially when it is correct and collected. But, when it is ugly, it is UGLY and hurts like a biatch hahaha. I am still used to trying to move with a shorter, quicker horse though. So it is taking me quite a bit to adjust. But it is fun, so it is worth it.
Littrella, if you're not comfortable, and having fun, speak up. You'll burn out, quick.
You should never be afraid, because it causes you to be tense, and when you need to be relaxed you could get hurt.