For anyone else going from Liverpool , there is an update. The ACC Arena Kings Dock is no longer being used so there is no need to go there now but instead go straight to the Cruise Terminal if you are arriving by taxi or getting dropped off.
You only need to go to the King's Dock if you are parking at the CPS Carpark there and there will be someone there to porter your luggage and take you on the shuttle bus to the Cruise Terminal