About how much did your whole set up cost you and were you able to install it yourself or is this something a plumber would need to do?

You are not. I wouldn’t trust a used hard drive in any way.

After seeing this comic for the first time years ago I always try to keep it in mind when someone tells me they are just learning about something. We all learn similar things for the first time only at different parts of our lives and being able to be a part of helping someone learn something new is a great feeling.