In May of this year I used Mac Adventures for a self guided coast to coast walk in the UK.
They also do self guided trips in Ireland. I told them the route I wanted to take and the min and max miles we wanted to walk each day. They booked the B&Bs and the luggage transport, privided maps, a detailed itinerary with instructions on how to reach the B&B each night, numbers for the local taxi companies that covered our route, and a 24 hour hot line. Pre-planning is important. From Macs and other sources we learned that a lot of the pubs would be closed on weekdays during lunch so we got boxed lunches from the B&Bs. Some of the smaller villages had little or not options for dinner. So we often booked dinner ahead of time at the B&B.
Macs is quite open to planning custom itineraries if you do not see what you want on the web site. Macs' use permit requires that you have your own travel and medical transport insurance which I ended up purchasing from American Airlines for $60 per person.
http://www.macsadventure.com/walking-holiday/europe-walking-holidays/ireland/
There are probably local outfits in Ireland that provide the same service.
