Followed the Bluestack Way sign mentioned by Aidy. The road is well surfaced now, though narrow. Drove a couple of kilometres NW (ignoring lower-down parking areas) to a small plantation on the left. Drive on a 100 metres or so and you'll find a parking spot on your right. Walk back down that 100 metres of road to the corner of the plantation. Step over a little mountain brook and from there it's an easy 20 minutes to the flattish summit area with only a short steep section to be negotiated. Head south across the plateau up top, keeping Sand Lough to your right, and you'll soon reach the little cairn. The round trip from this upper parking spot comes in at about an hour. Great views to be had over Lough Eske and the Bluestacks. Linkback: https://mountainviews.ie/summit/1067/comment/19842/