Frame & tub swap
I needed to do the swap due to rust. Of course, the indicates major issues with the likes of "RUST". If you don't have rust, then it shouldn't be bad. If you have serious rust, get ready for a whole passle of additional items that will need to be addressed while you have it off.
Then there are the maintenance items, such as ujoints, fluids, exhaust, etc.
I lifted mine off with an engine hoist. Left the roll bars and all on. Then stripped the tub as I moved stuff over to the replacement tub. The hoist came in handy for a lot of things. But most of those involved the frame swap and not the body swap part.
Just be sure you verify where everything comes out, keep the screws separate, marked, and all that stuff.
If I were to do another, just body swap, I would take the old body off, intact, and then install the new tub. Then I would swap stuff over.