I've replaced the injection control valve which is in the middle of the stack of the CAPS pump. Also replaced a head gasket and head bolts. That 8.3 head is HEAVY and the bolts are torqued pretty hard - I used a cheater bar. Did all of these at home, but I don't have any video or pictures.
You'll need the Cummins 'engine barring' tool. It's a little gear that goes in through a hole in the bell housing. It engages with the starter ring so you can turn the engine over manually. That's the only special tool I recall needing so far, but there could be others needed for pressing in/out the cylinder liners or something.
You can find a wealth of information for free through Cummins Quikserve. Create an 'owners' account for yourself, add your ESN, and poke around for the service info. It gives instructions, drawings, torque specs, etc.
I'd love to turn mine up some day too.. keep us posted.