And if you don't get changed, you might be surprised to find that you like second seating better. We have had 3 cruises. Our first two we were late seating and all along thought first would be better. This last cruise we were first seating and we HATED it. We felt SO rushed to get ready for dinner every night, and then my bedtime my kids were hungry and we ordered room service every night.
What I finally figured out is this: You don't have to 'dress' for the shows. People come dressed all sorts of ways. Then after the show there is about 30-45 minutes of free time that you can use to get ready for dinner for the second seating.
For first seating, you have to pull the kids out of the pool or whatever they are doing and go to the room and get ready for dinner, then we went back to the room and changed into casual clothes (well my kids did, DH and I stayed in our dinner clothes) and then went to the show.
Before, one of the appeals of first seating to us was that the Kids Clubs would do a really neat activity during late dinner time. This time they seem to wait until 9:30 for thier main evening activity so that all the kids could go. So now late seating works better for us.
Just thought I would mention this in case you don't get the early seating. You may be pleasantly surprised.
DJ