Don't over plan. Your adventures will find you, often just getting in your car and set off driving. Many Castles in Ireland are not castles as you expect, but Great Houses.

Don't move to a new B&B every night, too much hassle. Just move every few days.

Around Dublin you don't need a car, Dublin Bus is great. They have an awesome app, so you don't leave the pub until seconds before the bus arrives.

There is another good tourism app that shows you what is around and in what direction. You will have to find it.

Hail O is the cab app.