Easiest way to tell a clutch is dead: Rev the motor, dump the clutch. If you move, it's OK, if you don't it's dead. (just kidding).
I've been told clutches are fairly easy to do, but never done one myself. Get a manual, and just do it step by step. Remember, worst thing that happens is that you can't get it back together, and have to tow it to the shop for them to finish. Could end up saving yourself a few $$, and getting more comfortable working on your own rig.
Erik
