A complete and utter bastard, that's who! I did have a mechanic say to me that when it's installed in a Citroen (east-west) it's a doddle and makes complete sense, so maybe there's something in that.
I'm not done yet, but if I can do it anyone can. The reason I'm trying to document this is I can't find anyone else that has. All I see is "yeah I did it, was a bit of a bastard but got it done". So I wanted to do a blow by blow just so that people can see it's not rocket science. Can't say I'm not making mistakes or I won't fail, but I'll die trying (or the car will).
Also, bear in mind this is a 2.7. Everyone I've spoken to has said it's possible on a 3.0 but a *lot* harder as it requires timing and there is a lot less room to move (seriously??? less room???). Oh and there isn't actually room in there to get the 3/8 air ratchet unless I put a 90 degree air fitting on it. I'll do that for next time.

