Someone here wrote a review of the dirtwise school. By the end of the school the reviewer commented that his/her riding had improved substantially and on the 2nd day was already able to do things that seemed impossible the day before.
Your trials background definitely gives you a leg up, I suspect that Wattsy is going to help you on your cornering speed and taking obstacles at speed.
If he talk about downhill sections, pay close attention. Downhills are prime passing opportunities. Seriously.
all around good guy