Enjoy ! Enjoy all the sights but always be willing to sacrifice a stop or another sight on the itinerary for time to soak up the little things and enjoy the Irish people. Also the big sights are wonderful - Moher, Cashel etc. but an out of the way ruin not clogged with folks can be even more memorable - for us a standing stone in Derrynane, Staigue Ring Fort ......or take a walk through an amazing Irish wood like Tomnafinogue Woods near Tinahely - absolute quiet miracles around every bend in the trail - and time to talk with the funny, self deprecating, exceedingly genuine Irish people.
The Cliffs of Moher will always live with us but so will Scones from Brown's Market in Ballinskellig, Taytos, Margaret and her dog Holly, the Dyin Cow Pub w not a tourist (besides us) anywhere near and the warm, funny welcome we had.
In short give yourself time to soak up the little every bit as much as the "big" stuff !
BTW - no matter how,excited you are - it's better !!!!!