First off, take many spares, get a facer (if only so you can wear it and be rad, they are fun), Next off, ride within your limits, explore, and have fun. The blues and greend are AWESOME, and often less bumped and rutted. The Green from the non-chevannes side of Let Get is just rooty bliss, also the trail at les Linderats are more natural, less berms and table tops.
What will shock is the relentless gradient, do some arm and leg exercises before you go… I prepped last year by find a rought and rocky descent and riding it on the HT 3 times a week for a month, great calf workout.