Took me and a m8 from the GTO club about 5hrs with the odd tea stop on his new block paved drive using just a 3ton jack and stands.
Worse bit was getting the hubs to move......'kin big 'ammer and lots of WD helped but did do a bit of damage.
Tips........
Gently pull the ABS sensors out of there holders about 5-8 mm..not all the way out just out of the way.
Put suspension on to wading height then open a door or the boot otherwise the diff hits the gearbox and is a real pig to remove(dont ask me how i know)
Let any helpers catch the diff for you
Change the half shaft seals while your doing the diff.
Failing that ....................let Gav do it!!!:behindsofa: