The twin turbo models have very little space to be able to remove and install the lines. A few tips I have found helpful. I was able to do these in much less than 6 hours.

It helps to remove the r axle and the axle center bearing support.

Loosen the coolant feed line near #1 cylinder in the back of the engine. Remove the upper banjo bolt and you can remove the lower banjo, but it can be really difficult to get back in. If you loosen it, sometimes you can get the return line out and back in.

I use a little crazy glue on the new return line gasket to keep it attached o the line when installing. Lube the seal with oil or vaseline to help installation.

That's all I can think of right now.

3B