The job is not that bad, just time consuming and a little frustrating depending on what approach you take. All in all should take about 5 hours worth of work to get the clutch in and out. I would not think of replacing it with such low mileage unless it is already burned up. When you get the tranny out check for the packed in mud in the bell housing and pressure plate, disassemble it and wash in brakeclean, it evaporates fast and leaves no residue. If the mud is the issue, then find a way to seal it up as best you can when going back together if you insist on playing in the mud. Also go ahead and drain the tranny and diff fluids and change those with a synthetic, I reccomend Royal Purple 75W-90, and find your vent lines for the diffs and tranny and extend them up if there is water in them. something as high or higher than your deepest water you plan on being in. I usually extend them up the cage to the top of the buggy. If you get it that deep then you have real issues that no amount of extending lines and snorkleing will help.
Jarrad