How do I get the pulley off the power steering pump that goes to the serpentine setup?

 

you need a pulley puller.
Its like a 3 piece job that has a little collar. Autozone should loan u one.

 

What's the easiest way to get it back on? Do you need a press or can you pull it on to the shaft with a bolt and big washer?

 

The pulley puller installs it back on too. My kit cost me $80 but it was worth it just to not have the hassle anymore. If you can say it without getting your tounge tied ask for a power steering pump pulley puller kit. I always ended up having pimp in there somewhere.