Swapped mine tonight with the help of a buddy. Couldn't have gone any smoother.
You have to lift it in from below if the mounts are attached to the case. The passenger side mount cannot drop down from above (well, it could, but it'd be a real pain to wrangle it in there). You'll see why when you take it out.
Passenger seat out, floor panels up, 11 o'clock bolt/nut out of t-case (as you look at the front), put something long in there to suspend from the engine hoist poking through your passenger door opening. Unhook all drivelines, speedo cable, air connection and parking brake linkage. Support from below and pull all mount bolts, four on each side. Remove/lower underneath support, lower engine hoist and it's out.
Install is the reverse. Use that same lift point and get a couple of the front mount bolts in, then lift from below to "pivot" the whole t-case up to get the rear mount bolts in, then you're home free.