We arrived at the port early on Sunday. Unfortunately the ship was sailing from a remote pier due to the number of ships sailing from Port Everglades, so we needed to take a bus from the parking lot to the ship.
Check in went very smoothly-the HAL shoreside staff was organized and friendly and we were on the ship very quickly.
Cabins were not available until 1 pm and most of the passageway doors were shut to keep people out of the hallways. It's not a huge problem to wait provided you don't have a ton of hand luggage. If you're arriving early it's probably a better idea to have a small bag for personal items and hand over any larger carry on luggage to the porters. Otherwise you'll be dragging your bags around with you until you can get into your cabin.