Get a Banks Sidewinder(wastegated) kit, used if you can. The turbo sits far enough back that you can literally disassemble the engine with it in place.
You only have to take off the air cleaner/CDR tube(2 hose clamps), and the air box(1 hose clamp, 1 9/16 screw) to get access to everything.
I've left the turbo in place and pulled:
1. Injectors
2. Glow plugs
3. Intake manifold and valley pan
4. Lifters
5. Valve covers
6. Rockers and pushrods
7. Both heads, entirely, for gasket replacement.
It's nowhere near as bad as it might seem, and it's the #1 mod you can make to the truck that will actually do something. Take it from me; I was exactly where you were at 4 years ago. Now, a turbo goes on any IDI I really drive.
Note that the factory ford/ATS turbo isn't quite as good; it sits over the #7 glow plug and injector more and makes them a pain to get to.
That being said... it's still doable. I've done it.