if you tackle it, be careful. You'll want at least 2 jacks and a couple stands. You'll need to jack up the jeep, disconect the gear box and trans then get them out of the way. I had one that was a pain in the ass because the gear box would not brake free from the tranny. We uninstalled the trans and gearbox all as one big piece. Once it was out on the drive we were able to break them apart but it was not pleasent by any means... I do most of my own work, in this case, I had a friend help. Actually, I paid a friend to do it and I helped him. Not saying its hard, but it depends a lot on work conditions such as tools, lift, etc... In a driveway, it may take days. In a shop, a couple hours.
I suggest 2 jacks because of lifting and lowering the trans, holding the back of the engine up and also raising and lowering the Jeep. Once you pull the bell housing loose and slide the trans back, the back of the engine will want to drop.
See if you can find a write up somewhere out here with pics for changing a clutch.