It can stay alltogether.
Do yourself a favor and get a porta power to spread the frame rails as they will fold in a couple inches and make it a pain to get in and out. If you cant get your hands on one, a bottle jack and a 4x4 cut to fit will work just fine.
Just drill a hole about deep enough to seat the jack into the 4x4 so it doesnt fold up on ya. Other than that its just taking out bolts and putting them back in.
Good Luck