I replaced mine last year. The biggest thing is do not pull against the shaft. The pulley that the belt runs on is on a bearing that fits on the housing of the compressor. The clutch "plate" is mounted on the shaft. It has 3 holes in it that you can screw some bolts into to pull the "plate" off with. I can't remember if they are 1/4-20 or 6mm. There can be several shims under the plate to create the proper gap between the clutch plate and the pully. I can't remember what the gap should be, seems like it was . 020-. 030. The pulley can be removed after you remove a circlip that is under the clutch plate. I bought a cheap pair of snap ring pliers with large tips at the parts house and bent them to get to it. After you remove the snap ring you can pry the pulley off by prying against the compressor housing itself. Once again, do not pull or pry against the compressor shaft.
Scott