Support the sump with a jack,
make sure you put a block of wood inbetween the two though so you don't dent or damage the sump,
then change the drivers side one first, you'll need a deep socket as the thread's quite long.
Once that's all done, support the gearbox in the same way with some wood and a jack,
then swap the gearbox mount, it takes some persuasion and wiggling to get it off,
they'll be a point where you think it's never going to budge, but keep at it the thing will come off.
Getting the nut back under the gearbox bracket can be a pain in the arse,
I stuck it to my finger with some silicone to get it into place.
Just don't take the zip tie off the gearbox mount until the last minute,
alot of people take it off befpre they start and forget which order all the parts go in.
It's pretty straight forward, at the end of the day it's just a few nuts and bolts.