This heavy duty primary clutch puller makes removing the primary clutch easy.  This is not necessary to install clutch kits, but it save your back, some fighting, and make adjustments easier.  Just remove your primary clutch bolt with a 13/16" socket using an impact wrench or with a regular ratchet and pry bar through the clutch.  Thread this puller in by hand, then use the same method previously to tighten the puller in, and eventually it will pull the clutch off the tapered crankshaft.  
Having trouble removing your clutch?  Try using grease on the threads and tip of the puller to allow it to spin further.  If that does not work CAREFULLY pound on the end of the puller.  After hitting the puller with a hammer, try threading the puller in further and repeat these steps.  An impact gun might not be enough sometimes.  If you don't see the puller spin after pounding on it and you are using an impact, move to the pry bar and breaker bar method.