The way this trail is described here would not get a 4 star rating, unless you enjoy riding on gravel roads, if so, this is an excellent ride, and a hell of a lot easier than the route I suggest doing.
Leave your vehicle at the stables, drive 0.6 miles to the start of Black Mountain ( just past the Rangers Station) Now start the (about) 70 minute lung busting climb up to Black Mountain, once at the top of Black Mountain carry on along the the very technical grade 4+ - 5 trail past the insect infested Buckhorn Gap Shelter untill you reach the trail junction of Avery Creek and Club Gap. By now you will be cursing everything and everyone, so take a break here, 'cos your 4+ hours of uphill hell is going to be rewarded with 15 minutes of sheer downhill single track pleasure. Just be very careful screaming down Avery Creek, there are some unexpected technical sections, that if misjudged, could cause some serious problems to you and your bike. Once you reach the bottom of Avery Creek, hopefully in one piece, you would have forgotten all about your 4+ hours climb, and will be wanting more Avery.
If you really don't like climbing, but love a technical downhill, you could try and get someone to drop you off at the Start to Club Gap, ( still a 30 min uphill) and then have them pick you up at the Stables.