97 Taurus 3.0 24 V

How do you take power steering pump off and replace pully. 24 Valve Motor

Start with a manual. I’m not familiar with this car, but since it’s a V style motor transversely mounted with transaxle I’m willing to bet it’ll be a lot of disassembly to get at the pump.

I’m curious…why do you want to replace just the pulley?

You do not need to remove the pump to remove the pulley. Go to your local parts store and borrow/rent/buy a pulley puller & installer.
remove the coolant overflow tank, remove the belt, remove the pulley.
~Michael