What would I need to install one of them in addition to my existing hard drive, how difficult would it be to work with (e.g. could I move steam games onto the new one and run it just the same), and are there better suggestions?
I believe all you do it right click a steam game and choose "Backup Game Files..." then select the games and what drives you want to put them on.
Be sure you have a spare SATA cable and an extra SATA power cable port on your PSU.
Also I have a question: Is it okay to use two different brands of RAM on the same motherboard?