If I told you the most enjoyable part was when the water came in over the top of my gaiters, that will give you some idea of what to expect.
Park at W201 621 A near the highest point of the road (just space for one car), follow the fence up though knee - waist high grass until you reach a fence junction and a track of sorts. Follow the track to it's end, climb the fence and head straight up where you'll find a gap in the brambles where you can cross to a forest track.
Follow this track up and past it's highest to just before an obvious corner where you are about 160m from the summit, you need to cross a dike (which I discovered is knee deep in nice smelly stagnant water) and some young trees to a slight clearing of very rough ground before entering the young trees again.
Now it's a battle through horrible horrible (did I mention it was horrible) trees and brambles to reach the top thoroughly scratched and beaten. No views worth talking about. Return by the same route. Linkback: https://mountainviews.ie/summit/1099/comment/18316/