The Wild Atlantic Way
is a super place to do a self-drive vacation!
It's also great to hear that you are looking to stay for a few months to really enjoy the experience of the Emerald Isle.
I would suggest that you contact a few different rental companies with regard to insurance and rental for such a long period of time. I have a link to some information on Renting a Vehicle
in Ireland that contains loads of useful links including one to some rental cars companies. Each has it's own term and conditions so I would recommend contacting them to see what offers they can do for the duration of your visit.
Credit Cards are the preferred option for paying for the insurance as they are not charged immediately. Again, each company would be able to explain their charging process.
What have you planned to see and do with your time after visiting the Wild Atlantic Way?
I am sure our fellow members will have some great suggestions on activities and places to visit to fill your time.