No special access issues
The best approach is from Ma On Shan Mining Village, which is accessible using the NR84 shuttle bus (see here). From the bus stop in the cup-de-sac follow the stairs up the hill to another small road. Continue along this as it transitions from paved road, to dirt road, to eventually become a dirt trail just beyond the car park area.
Follow the trail up the hillside until it eventually brings you to a crossroads on a small summit with a rest pavilion on it. Take the fist turning on the right and follow the dirt trail up the hill until you reach a cluster of boulders at the Summit Ridge, this is the Slasher Bloc.