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 small slightly overgrown trail in the southwest corner of this (far right side as you approach it and just behind the pavilion area) and follow this southwest, staying to the right of the deep drainage ditch when the trail splits after a 100m or so. Continue along the trail, which follows a vague ridge line on its left side before eventually disappearing amongst the vegetation. After this you’re left to your own bushwhacking ability for the last 10 minutes of the approach hike – hopefully with a bit more traffic the trail will become more established. In the meantime, keep an eye open for little bits of white rope tied to vegetation as we tied some of these to help mark the way. Regardless, your best bet will still probably be to use Google Maps and head for 22.392724 114.244738.