I just finished this a few days ago, and a couple notes. Both diesel bombers and the factory plan have you remove way more stuff than is needed. I did not unplug hardly any electrical. I pulled the air intake (box to turbo), moved the a/c compressor, and two rubber air hoses across the top of the engine near the turbo. Remove the turbo horn, the FPR is just below it. You'll need a new gasket upon reinstall, I used a gasket maker product. If you remove the upper coolant tube, you can get to two of the Turbo horn bolts with ratchet extensions/ wobble sockets. The third is a pain and use either a ratchet type box wrench, or if you have one of the "flexible" cable type extensions, you can get to it with that.
I also did remove the upper metal coolant tube, you lose very little coolant, but get considerably more room to work. You can either take it apart at the thermostat housing, with tube attatched, which gives you the most room, or pull just the tube where it plugs into the rear the thermostat housing area. This metal coolant pipe if secured by a clamp on one end and an o-ring and single bolt where it goes into the housing. You will need a new gasket or o ring to put it back together, depending which path you choose.
I removed one end each of the fuel lines in the fpr area and this allowed me to tuck them out of the way enough to work.
For the torx bolt themselves, read all the fpr posts here on tips and tricks, and tools. Normal 1/4 socket and short torx bit will not work, there is a picture on this site showing the clearance issues. You can't get a solid straight purchase with the bit in the screw and risk stripping them. I used a combination of all the tricks found here.
I also found a #25 torx screwdriver at TSC that has a hex shaped shaft instead of round. I cut the handle off, and the shaft fit into both a 1/4 socket to bit driver adapter, and through the middle of a 1/4 ratcheting type flat wench. If I did it again, I would have gotten 3 of them, and cut them to different lengths to use in the various situations you will find yourself in when removing / installing the bolts.
Good luck!