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Pack warm clothing. Pack any other necessary items. Get a guidebook. Buy a map or GPS system. Exchange your money for the proper currency.
Even in the summer, Ireland can be chilly. If you're traveling during the winter, you will definitely need warm clothing. Rain is common in Ireland, so bring hats, raincoats, and hoodies. Make sure to bring a hat, jacket, socks, scarf, gloves, and comfortable shoes, along with your outfits and undergarments. Bring clothing that can be mixed and matched to avoid overpacking. Buy thermal clothing if you are traveling during winter. You can choose to pack or bring things like toothbrush, toothpaste, shampoo and conditioner, razors, and other items. You will need to bring your passport, an adapter (Ireland does not have the same outlet as the US and other countries), health insurance information, your wallet, and driver's license. You should also bring any necessary medication in the bottles they were prescribed in. Make a list and check it off as you're packing. You should bring at least one guide book with you. Guidebooks help you find attractions, eating recommendations, helpful information, some history, and advice for accommodation and travel if you need it. Some guidebooks are general, and some are made specifically for certain audiences. For example, you can find a guidebook made for students, but you can also find one aimed at families. Some guidebooks to choose from are Rick Steve's Ireland 2016 (or whatever year you're traveling), Lonely Planet Ireland, and Frommer's Guide to Ireland. Backroads Ireland is a guide that comes with a map and gives advice for visiting the hidden gems of Ireland. It is helpful to keep a map or GPS system with you, especially if you're driving. If you're staying in one city, you can find a map of the city. If you're traveling throughout Ireland, it is good to buy two maps. One map should be a map that is focused on roads. The second map should focus on site markings. Smartphones usually come with a GPS, but it can be very expensive to use your phone if you are outside of your own country. You can exchange your currency for Irish currency once you arrive in Ireland, but it is good to have some cash with you before you arrive. 100 euros or pounds is recommended. Northern Ireland uses the pound sterling, and the Republic of Ireland uses the euro. Get the currency for whatever part of Ireland you will be using first. After that, it is better to withdraw money from ATMs (cashpoints). The exchange rates vary a lot, and you get the best deal when you use your debit card to exchange money rather than going to an exchange place in the airport. Make sure to let your bank know where you will be traveling before you go. Many banks will allow you to set a travel notice on your phone. If you don't, your bank may think your card was stolen and cancel it.