Usually you would pull the engine away from the gearbox. I'm not 100% sure there is enough space to pull the gearbox out.
James managed to change the clutch without removing either, might be worth asking him?
And what a pain in the arse that was, I had a gap of about 2" to slide the friction plate in centralise it and torque it all up.
Personally would never do it that way again engine out is so much easier and prob quicker
If you do it that way you need to do the following@
Remove front bumper,
Remove rad,
disconect oil drain pipe from gearbox,
unbolt downpipe,
Undo turbo oil feed,
remove any turbo coolant pipes,
Remove turbo,
remove engine to gearbox steady bar,
Remove flywheel cover under engine bolted to gearbox,
Undo gearbox selector rod,
Undo rear engine mount,
Undo gearbox front engine mount,
Remove drive shaft pin for drivers side shaft,
Undo lower balljoint bolts on drivers side (this will enable you to pull the driveshaft off the gearbox and yet still have it all attached to the car )
Remove drive shaft main bolt this time from hub 30 or 32mm I think,
Remove passenger side lower ball joint bolts,
Remove TDC sensor 2x 11mm bolts,
Remove starter motor,
Now just unbolt the gearbox from the engine you may need to help pull the gearbox off once all bolts out use a crowbar or big solid flat head screw driver.