Barraboy is best reached from the col between Esk and Barraboy which can be reached from the Beara way. There is parking to be found at V91693 59415 A almost opposite The Ewe Experience (or next to the building itself) on the N71 to the south. Walk 100m east to the Beara Way track at V91922 59372 B and turn north, follow it it for 2km up to the col between Esk and Barraboy, next to a transmitter of some sort at V92620 60624 C, turn east and follow the ridge up a mostly grassy slope for about 1.3km (there is a narrow track some of the way) to reach the summit, which is marked by a large cairn.
An alternative is via the N71 to the west of Turner's Rock, where there is parking for a couple of cars. Climb turner's rock and then follow a way marked trail to the col mentioned above.
Views are very good south to the sea and North towards Barraduff. Knockboy is clearly visible to the East. Linkback: https://mountainviews.ie/summit/579/comment/5338/

Parked at V93218 61229 D (barely room for one car) beside Beara Way stile. Over the stile and up the track, I left the track and went straight for the peak, but it's probably best to follow the track to the col and walk along the ridge enjoying the views down to the bay. The peak is marked by a large cairn. Linkback: https://mountainviews.ie/summit/579/comment/14982/