Help changing power steering pump

[BrookelynnGreen]

My truck squeels and the steering is hard to turn sometimes. I priced a power steering pump and it will cost around 35 dollars. Can someone please tell me the steps of replacing a power steering pump, and how would I draind the power steering fluid?

THANK YOU
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P.S. I called a shop, they said it will cost 315.00 +tax to replace the power steering pump, I want to learn to do it myself.