Sore finger apparently.
No the one we did was an 09 ml and fought us every step of the way. Every bolt or nut was rock solid. Some had 2 blokes on a breaker bar which is stupid tight.
What I was really getting at is that it is no small task and the margin for error is not high. Seals on the injectors and fuel lines need to be absolutely spot on, you end up with most of the loom off the firewall, some of the bolts are hard to reach (not as bad as the mn), you need to be extra careful to keep the injectors clean and untouched at the business end, your torque wrench will get a workout, coding the injectors can be a pain in the arse (mostly if you forget to note the codes before burying the injectors in the middle of the engine bay) and so on.
If you do this work all the time and have a system to it, the right tools, know all the torque specs and have all the right gaskets and seals and stuff I'm sure it gets easier but I guess my point was that it wasn't a task to be entered into lightly.
We complicated our situation by also doing a rail limiter, timing chain guide, SCV, turbo, intercooler, egt, afr and boost gauges and various other chores so perhaps that has skewed my view of it a little. Also it was about zero degrees out, apart from the night it hit minus 2.
As for the manual I had part of the ml manual in my Dropbox that I was able to send and which did the trick in this case. I'm sure I've seen an online version that works but was away from my main PC at the time.