Park at SH591611 (sorry, too well brought up to use Flash Earth :tongue: ). Follow the obvious track bearing south-east for the best part of a mile then head up the big incline, the second you'll have seen.
Follow your nose after that, you can't go far wrong!
You'll have missed some big and very interesting chunks but you'll see as much as you need to see in a day and should have got your bearings.