If you're a correctly trained Hunter rider, you have an advantage, locally anyways. Around here, local riders don't seem to do anything other than run and jump. It's the clear, precise and careful riders that win.
You already know how to get good distances, now you need to work on your turning, comfortably extending and collecting your striding and seeing the best course of action. As the fences go up, you'll need more and more dressage. I found it very easy to switch from Hunters to jumpers.... it was also a little freeing since I didn't have the flashiest of mover.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse