At the time the car was in Portugal in an underground garage and I had few tools at hand. To do the swap of the GPU I brought out some long 1/4" extensions and a set of magnetic sockets as well as a slim bar style flash light. There is a lot going on underneath the manifold and w/o a lamp impossible to see.

There is a good video on you-tube showing the GPU swap. The maker correctly stressed that you need a longish screwdriver or other tool to pry out the connectors first, then unscrew the two 6mm nuts. IIRC, the GPU comes out sliding it towards the back and then up.

Taking the manifold off obviously makes it much easier but introduces a risk of something tumbling into the intake ports. I finally did take the manifold off last summer (for the vac lines & actuators) and it was missing the rear of the small washers with the rubber piece attached (probably lost when dealer replaced 6 plugs and GPU under warranty/recall?). I was feeling quite uncertain, until I checked with a borescope, that it had not fallen in to the port.

Also beware, if you are somewhat OCD with your cars, once you take the IM off you get into a long process of "might as well while in there".... :}

__________________
2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.