The path to the peak is sporadically marked along your route, but it can be easy to miss the markers and go astray- I missed a few on the ascent, but as I was nearing the top and could see where I needed to move towards, it wasn't an issue.
The route moves from boggy to dry, loose shale and would get quite mucky on a wet day. Lower on the mountain, cattle wander freely, whereas the farm animals you'll meet further up are sheep.
Along the route are large, whitewashed crosses marking the Stations of the Cross, and at the end of the route is a larger cross, marking your culmination. The views along the way are wonderful and particularly good from the top.
The descent is basically the same as your route up, but with the assistance of gravity, it takes less time. However, exercise caution- your legs will probably be tired at this stage and it is easy to slip and fall on the loose gravel. That said, when I was resting at the final cross, a runner jogged past me and ran back down the mountain, taking a much steeper route than I would have dared attempt!