It is not too difficult. You need a three prong pulley puller. You can usually get them loaned to you from a parts store.
Leave the belt on the super charger, remove the bolt from the nose, take off the belt and then use the pulley puller to remove the pulley. Spray the nose with brake parts cleaner, put some anti-seize compound on the shaft and slide the new pulley on the shaft. Be careful not to bang or hammer on the shaft as it may damage the snout seal. When you get the pulley on most of the way you can slip the belt back on to help you tighten the bolt. An extra set of hands really helps make the job simpler.
Bob