After a few requests I've done some sleuthing, including speaking directly with four boat captains. Here's is a bit of info which will correct some of what's already in previous posts, and clarify more....
Some boat captains ARE taking reservations now, for summer. HOWEVER they are still waiting on the official opening date (that's determined by OPW - Office of Public Works), so they will take, say, July bookings, but are waiting on May and early June bookings in case it's not open that early for landings.
Additionally, no one officially knows if they are granted the license to take people out, yet. Clearly, almost everyone that passes the inspections year after year, does get the renewal. But some might not be willing to book - just know that at least 4 of them are!
It's strongly suggested you stay near the Skellig Coast area, so as not to miss the boat and to enjoy the area after the cruise. There are too many people rushing in and rushing out and not doing anything in the area - and area full of culture, myth and beauty! There is talk about setting something up like they have in Scotland at St Andrews Golf Club.... if you want a good tee time during peak season, you have to committ to 4 nights in the area. They won't do THAT down here (I'd bet my bike on that) but they are close to requiring a night in the area before they go out!. (For an example, one guy on my boat in September drove in from Dingle (where there is a boat, actually) to portmagee, and then went to Galway that night. It's not safe to do that kind of driving, in most people's opinion! Don't push it!
There has been quite a bit of backlash due to the Tourism Ireland group jumping on the Star Wars bandwagon. They are now advertising, aggressively, an experience that was already 100 percent booked last year! So be prepared for other alternatives in case you cannot make the boat landing (due to weather, too). You might do a boat ride AROUND Skellig Michael and Little Skellig. A trip to The Skellig Experience on Valentia Island near Portmagee bridge. Viewing the islands from The Kerry Cliffs; St. Finians Bay; Bray Head...... Following the "Monk Trail" that includes Ballinskelligs Abbey, Church Island in Waterville, and more. There are tours (Iveragh Historical Tours is one) that can help you explore the Skellig Monk experience..... without making a 7 mile boat ride over open ocean!
Susan
Expat living in Waterville, Ring of kerry/Skellig Coast