Spadge,
You must be having LOADS of cups of tea in that 2 hours, as it should be 30-40 mins out and 30-40 mins in IF all the bolts come undone okay . Is best done with two peeps (or a jack) once you get to the point of dropping it down / putting it back, as it is awkward to man-handle in a confined space if you are doing it on axle stands.

There is also an order to do things too - undo the drive shafts FIRST or you won't be able to use the gearbox to stop the diff from rotating (and believe me, you WILL need the leverage to undo these!).