Clutch change is a pig of a job mate. I think its technically possible to do it without removing the engine/box, most garages drop the subframe to give better access. If you do that, technically you need alignment pins to refit, but in practice I think the tolerance is such that you can line it up by eye or using some sockets as guides.
I've not done the job myself and TBH its not something I'd recommend unless you're very handy with the spanners.
I've not done the job myself and TBH its not something I'd recommend unless you're very handy with the spanners.