Did it on a ZZR 400 (had only done 30,000Ks) which is very similar, took about 1 hour, hardest part was getting the plates out as the oil sticks them in, bent bit of wire fixed that.
Keep things clean. If you need to remove the clutch cage use a rattle gun as I broke one of mine, I even made up a massive great holding tool like the manual told me to, which didn't work, rattle gun with correct size socket took 30 seconds.