I did it last year mate, BUT didnt organise anything, people pulled out and got offered the places so just paid my share, but I know it was all booked up long in advance, specially the ferry, and even then the gits kept raising the price of the ferry.
We stayed at a camp site at Kirk Michael, walking distance to some decent views.
One thing I woud advise is wrap up warm and bring really warm stuff to sleep in, we were wholly unprepared for how cold it got!
This reminds me totally forgot to do a write up of my trip last year and to post some pictures