Hi
No reservation needed.
You pull up to security guard who checks everyone's ID. Then you are directed to luggage drop, still in car.
Drop luggage. At that point, you can either stay together and drive to parking lot as a family, or leave most of family to proceed to check in while one person parks (pro tip...if you separate, person who parks must keep ID with him/her).
You proceed around loop and have a choice to do more expensive VIP parking which is closer to ship but not covered--a factor in the Florida sun--or to the parking garage, which is a multi-floor garage with lots of spaces. I do the garage. Pro tip--there's a walkway to the terminal on the third floor. This walkway heads to its own, off-the-beaten-path x ray/security tahtcan be less crowded). If you choose instead to cross back to terminal on 1st floor, line can be longer to get into cruise facility (others being dropped off) and for security--just more people down there.
If you split up, you will ahve to meet your party before they can check in. For this reason, and becasue we were early, last trip we stayed together after luggage drop and BREEZED through security and to check in as a family.
Hope thie helps.
WJS3