A clutch change on a motorcycle is REALLY simple. Monkey with a stick would have it completed in an hour, tops.
As far as replacing the steels, it's not necessary unless you used ALL of the friction material on the old plates, or they are scorched from abuse. The standard check of "goodness" for the steels is to place them on a pane of glass and make sure they lay flat. If they pass this test, just sand them mildly with some high grit paper (like 1000) to scuff them up prior to re-installation.
Re-install with new friction plates, and preferably new springs, and it'll be like brand new. A new gasket is not always necessary, but good piece of mind.
Oh, and BTW - the "mechanic" who said that Kevlar clutches break apart was talking out his ass. Probably saw it once on a stunt bike that just finished a burnout contest and wouldn't move afterwards...
