If you choose to do it yourself, invest either a FULL day, or a couple afternoons, and make sure you have a friend!
My dad and I pulled it in maybe two hours, but we also bought a transmission jack (which I HIGHLY recommend!). Getting it lined up properly for installation was a PITA, took probably six hours (also had horrible problems with bleeding the clutch! ... and still do...).
It's actually nothing special to just do the clutch, just make sure you have an impact gun to remove the flywheel and a torque wrench to install it, as well as a great assortment of sockets and extensions.
I have no clue about the T-case though, never touched the inside of mine, although I know snap/lock ring pliers will come in handy! (as previously stated)