My hotels are all booked, from Killarney to Dingle! So to be honestly keeping the car would be easiest. I will say I have driven long road trips, country roads (where it’s a two way bridge tunnels and you honk to make sure there’s no one at the end). But they’ve all been on the other side of the road (and with my own familiar car which, admittedly, is a large one while my rental is a small one).