To add to what Specialty said -
Pulling the tub is pretty straightforward. The more people the better but I've removed a couple by enlisting only the help of my 100 lb wife. Just make sure you have removed all the mounting bolts, wires, and cables that are attached to it. It only takes one to to bring the process to a quick halt.
I'll again add to Ryan comment.......make SURE you check and double check you have all the wires and cables unhooked before you get to lifting the tub up. Most of these old Willys have been "worked on" over the years and may have eveything from extra brackets and extra electrical wires to bailing twine holding things together. Not much telling what you may find when you get to lifting up the tub. It is nice to have a pair of side cutter pliers and a utility knife in your pocket when you start lifting.
Randy's process with the saw horses works very well if you are by yourself. It gives you plenty of time to find all those booby traps left by previous owners. It also prevents your Dad from getting too excited with the front end loader and ripping another hole in the floorboard when he gets in a hurry to get the tub off..... :-?