My response would have been the same as Handyman's - although I've not seen or changed one. You well know the trials of the hydraulic failure best avoided! Interested to read up on your experiences with this one, as no doubt it will come one day (123k on mine so far and no rattles yet). I remember the Doc of BX fame changed one in a 2.1TD and reported it took 10 hours, and he would rather sand paper delicate parts of his anatomy than do another - which must make it pretty horrible
Having tackled a similar one (C5 2.0 HDi with a 6 speed ML box), my tip would be ignore fighting with unclipping the gear change cables, and just unbolt the whole bracket off the back of the box - 3 off 13mm (IIRC
) reached over the diff - takes a couple of minutes.