Hey Shelly
All these sorts of things are always on the Apple Support documents and usually on YouTube too!
[
manuals.info.apple.com]
Very easy to install pretty much anything in a MacPro.
Just make sure you earth yourself or discharge any static by touching a metallic water pipe or a radiator on a central heating system (these have to be earthed).
For instant answers to more than one hundred common FCP questions, check out the LAFCPUG FAQ Wiki here : [www.lafcpug.org]