Beautiful hike and really worth it! Views over the Killarney lakes from the top are amazing.

If you are a good hiker and used to going up mountains/volcanoes, this hike is fairly easy. A lot of loose rocks, so better not to do it in wet weather and better to do it with trekking poles, but nothing that feels like a strong workout.
And I’d say, taking your time, being careful with the terrain and with good gear, really accessible to all sorts of hikers.