Replacing a clutch is pretty much an all day job for someone that hasn't done it before, but it is something that is not a huge problem if you have some mechanical skills and a helper. It's a great learning experience, and there are plenty of write ups, and general help on the forum if you want to attempt it. Whether or not to jump right into it depends a lot on your circumstances and how bad off you would be if it gave up all of a sudden. If you have a place to work on it and don't absolutely have to have it for a while, you might want to keep driving it til it gives out, then deal with it. If having the Jeep unavailable all of a sudden is a bad thing, you might want to go ahead and get some parts and schedule a day to do it. It's really hard to say how long it may last...it could be a week or a year.
If you decide to do it, let me know what engine you have and I can give you a link for a reasonably priced clutch kit.