oldgit, Yes, if you look at the start there's a little title sign high in the trees. Startlingly narrow in places, as my bruised shoulder will testify.
Juiced, just turn up and find someone to go round with – that's how I was shown few trails, then I knew what to look out for. Or, going into Phil Corley's and finding out when they're going out is another option (if you're fit enough !)
There's tons of riding, hours of singletrack once you find it. Don't forget Stocky Park – there's also a couple of good loops signposted in there..