I bought a ps pump pulley tool from oreillys when I was pulling the pulley off of my factory pump to stick on my psc pump. The tool made it super easy and took a whole 10 mins or so from start to finish. Just remember when your pressing the pulley on that the side with the indent on the shaft goes towards the front.
There are tricks to the trade.
Bring it to me and quit stressing!
BTW: knowing how to use the PS pulley tool right is something that escapes mechanics as well, so I see guys do the same damages, should be a simple 10min job.