To get a decent place to stay, a year in advance is not enough for the TT nowadays though it's possible to find something at the last minute due to cancellations. Even for the Manx GP, we have to make the reservations for the following year while we are there. IOW, we had to decide/reserve the place for this year's Manx ('26) while we were there at the Manx in '25.
Re the ferry - my wife and I looked at some videos of the ferry "experience," and her reaction was, "I'm not doing that!" With a disappointed look on my face I responded, "Really? I thought it would be fun!"
In my head I was thinking, "Thank God, I didn't want to do it either!" :) TBF, when I was a young rider, I think it would have been great but it looks too stressful for me now. It's like camping; I used to really enjoy it; now I don't!