Where are you?
Round these parts you will have a fair amount of room on a novice section, 4 foot perhaps? you will most likely at this time of the year find som slippy cambered turns and small to medium climbs on the slippy stuff, perhaps the odd log but nothing that should cause much concern as long as you can lift the front wheel over them (maybe 2 foot? probably less) the same goes for rocks.
But your main tests will be the cambered turns on the snotty stuff.
Good luck on the first trial, and remember to relax and have fun