There may not be one obvious route up Cooneen which is surprising for such a small place. The ascent shown here which went to the east and followed an overgrown temporary track did work, but there may be better routes.
The way down from the summit which could also be used as a way up, went first through a belt of decaying lodgepole pine underlain with briers. Long trousers a good idea. It then came to an overgrown but quite definite track down meeting the main track to the public road.
Note also that the public road to the forest entrance ( shown on thegps track) is also seriously problematical because it is single lane and for long sections completely devoid of passing places. You might find yourself backing 400m if you encountered another vehicle.