Imray cover the west coast in I think 3 main charts that have large scale inserts of some key harbours. Admiralty charts for more detail on smaller areas but in full size only. Not available in leisure format afaik.
When I sailed round there I had some Imray chats and the Irish Cruising Club pilots and that was OK. Now I've got Memory Map and Navionics plus what ever is on the Garmin.
But I'd still rather have those charts and the pilot books, plus the craic in the pub.
No matter what you use, you will have a great time. Ireland, all of it, is a cruising gem.