Really would depend on what time you would plan on being at East Point at. With schools going on holidays shortly traffic should be lighter.
Bearing that in mind I think the best option would be all the way in the N7 , straight at Red Cow and continue straight at Inchicore. Turn right at Emmet Road , then straight all the way through Kilmanham , Thomas St , Christchurch , Dame St , Trinity College and turn right onto the Quays on O'Connell bridge. Then go left at Liberty Hall and follow the flow around Busaras onto Amiens St. Continue straight until you come to a fire station on the right then turn right on to East Wall Road. After you go under a railway bridge take the next left on to Alfie Byrne Rd , then first right into East Point. Sounds tricky but it is pretty straightforward.