The packing is the only hassle that you will actually have, as long as you tell bell services where you are going to stay next, they will move your luggage for you, in short, you pack your luggage, call bell services ( beware that some resorts require you to be in the room until they pick up the luggage ) they come and pick up your luggage and mopve it to the new resort, you can go on to the parks or whatever you are doing that day and when you get to the other resort to check in, your luggage is already there, voila! that simple.
Hope this helps!