I wanted to address your "Buyers Remorse". I have been on 10 cruises (all different lines) including the Norway. Talk about old! However, the Norway was in great condition and one of my best cruises. The insides on the Norway are really small too. After the first day who cares. A day at sea ia always better than a day at work!
I always read the reviews and find very little fact in most of them. They are good for an over view and should be taken with a grain of salt. NCL gives a good product for the price and thats what you booked on.
I booked two inside cabins for the 15 day Panama Canal trip in July. I was planning on taking a crusie on HAL but the Sea was a great deal. Be positive, you are going to some great ports and older ships always have a special charm.
Have a good trip!