Hi!
Riders self organize into groups, by skill level. I think the groups last year were 'beginner', 'advanced beginner', 'slow intermediate', 'intermediate', 'fast-intermediate', 'expert', 'extreme'. Newer riders should go in the beginner groups. Groups are led by folks who know the trails, and sweeps are there help folks as well.
I recommend coming out - there will definitely be a group for you!