First-timers often seem to have a bit of difficulty, for some reason.
Leave the M61 at Junction 6 and turn right. Straight across the roundabout, past the Reebok Stadium and turn left at the next major roundabout.
After about 2 miles, go straight on at the roundabout - the Joseph Holt pub on your right. Couple of hundred yards later, turn right into Lever Park. Straight on for a couple of miles, past the lower barn on your left, and turn right up the lane to the Upper Barn. Sorted