I've got one you can have a bit cheaper that that
It's not the easiest job in the world, and you'll need a couple of long ribe bits (totally alfa sell them I think). It goes a bit like this:
Remove anything that's in the way of the sump (undertray etc).
Drain the oil.
Disconnect the exhaust downpipe from the manifold and support.
Undo the 10 (iirc) larger ribe bolts from the front and rear of the sump
Undo the 4 smaller ribe bolts from the left/right ends of the sump (the ones next to the gearbox are the hardest to access and I sometimes need to use a ribe-ended screwdriver with mole-grips on the handle).
Undo the horizontal bolt that goes through the rear engine/driveshaft support. This is a pig to get back on.
Undo the sump bolt that attaches it to the rear engine mount.
That should be the sump free, save for the instant gasket that seals it, so pry it off carefully.
Once it's released, you need to undo the 2 oil pick-up bolts (11mm). I can never remember which way round to do it, but I think you undo the front one completely and slacken the rear one. Swing the pick-up pipe to the front of the engine, and the sump should pass the pipe and finally be completely free.
Refitting is pretty much the reverse. I find that applying the new instant gasket to the block, ie not the sump pan, is less messy when doing it on the car.
The horizontal bolt I mentioned is really fiddly to get the washer and bolt back on. I usually have to stick it to a screwdriver with some grease and coax it into place.