Once you've got the bearing and all set screws removed and the spray oil applied, the very best way I've found is to apply vibration with an air hammer to the shaft while prying gently from the back of the pulley with a prybar.
The pulley is relatively flimsy and will not stand up to very much force at all. Any beating usually puts dents in it and worse, knocks it out of true. The vibration of the air hammer has worked for me every time.
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