Trail Running Newbie

To spice things up a bit, I have signed up for a 10 mile trail run in New York at the Holiday Valley Ski Resort. I've tackled a 5k Xterra trail run before, but there's a big difference between 3 miles and 10 miles. The good news is that I'm physically able to do a 13.1 mile road race. Obviously, I will want to add a lot more hill work, lots of squats and switch my weekly long run to trail running. I'd like to get some feedback or advice from runners who switch it up every now and then with trail work. Definitely looking to this new challenge!