Power Steering Removal

okay...how about replacing the power steering pump...cause i'm leaking power steering fluid somewhere...when i looked under the car it was near the bottom of the downpipe. I'm not sure what the thing it's leaking from is called. I have a replacement PS pump and alternator i need to put it...cause my car loves to sqeek when i have my light on at night and it's coming from the power steering pump...or even alternator and both belts are tight