I'd suggest arriving at the port by 10 am if possible. Have your cruise docs filled out before you go. You can check in without mobs of anxious people and be in line to board by 10:30. At that point, you will have to wait for approx 1 1/2 hours to board but its so worth it and when you board at approx 12 noon, wait till you see the length of the line behind you. I think you will be glad you're toward the front. Plus, you and your companions can take turns leaving the line to walk outside, get a coffee, use restrooms, etc. No one in line ever seems to mind that.
If changes are needed for your dining companions, go to Rockin Bar D as soon as you board the ship. The Maitre D table will be there to assist you (they are adjacent to the Palo reservation table). While in there, another member in your party could go to the Palo table and make reservations.