You don't need to take the engine out.
Changing the clutch itself is straightforward; the difficult part is getting the gearbox out to gain access to the clutch assembly. I'm sure forum members will have different opinions as to what needs removing, but if you don't have access to a lift, removing the bonnet and radiator will allow you to work comfortably from the front of the car (although removing and replacing the gearbox can be hard on the back!).
You can either remove the driveshafts completely, or just disengage them from the box - this does leave them waggling about, though, and leaves you with less room to work.
Disconnecting the exhaust from the manifold makes it easier to jiggle the engine up and down.
You might have to remove the steering rack to allow the box to come out; if you do, there are shims behind the rack which must go back in exactly the same position. If you're not careful, they can fall out before you've had a chance to make a note of their position.
You'll need a centralising tool to help fit the new clutch plate - an old gearbox shaft is easiest, but some clutch kits come with a plastic tool for this. If the disc is off-centre, it'll be impossible to get the gearbox back in - and bending forwards with a heavy gearbox isn't much fun!
Oddly enough, refitting the nuts on the clutch cable can be one of the fiddliest and most frustrating parts of the job.
Make sure you replace all three parts of the clutch - it's not worth going to all this trouble just to replace the disc.
It's a satisfying (but tiring) job to do as long as you aren't in a hurry. Best of luck!