At the parking area there is a house left of the big drainage that heads up to the crag. Between that house and its garage is a staircase leading to a terrace. Just left of the old outdoor toilets (not in use anymore) is a slab with a rope hanging down. Ascend the rope and then move right, back toward the gulley and the crag. Cairns will mark the path, taking you up steep 3rd class terrain with fixed lines for a little bit, ultimately leading right to the base of the Boneyard Wall.