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/