If it was me I would replace the hoses first and make sure the engine starts before messing with the DV seals. Even if you have to go on/off with the IM twice, it's not that hard to remove once you know the tricks.
"Break only one thing at a time" is my rule of thumb, I am a field engineer that deals with power systems and this applies here too.
When you get to the DV seals, be sure you have an accurate torque wrench, keep things surgically clean, and follow the process exactly. Otherwise you will have a very expensive paperweight. Go on YouTube and look for dieselmeken for a video that shows the exact process.
Found it:
http://youtu.be/-SW1dRGpHPU
In that video he shows removing the shut off valve. You don't have that, they started using that in 1996. But the process for the DV seals is exactly the same.