HOW TO CHANGE POWER STEERING PUMP on 2004 Porsche Cayenne Turbo

I NEED TO KNOW HOW TO CHANGE POWER SEERING PUMP

2 answers
My labor guide says it's a 3 hour job for a professional, Alldata as Bob said is the best source for information but read the instructions first and make sure you have the tools and knowledge to complete the job.
If you're working on a Porsche, and you don't know how to change the PS pump, then you really need to get a service manual. You can find an aftermarket one at an import car parts store.
Another possibility:
Here are two online sources for you:
For AllData:
http://bit.ly/AllData_Repair_Manuals_Online
For Mitchell:
http://bit.ly/mitchell_repair_manuals_online