MyBB Community Forums

I currently use iPage hosting, and may upgrade to their VPS. How hard is this to do and how would I go about doing it?

Well, the complete process may be quite extensive. Especially so if you have no prior knowledge of managing servers or server security/optimization.

MyBB wise, you move the forum files to the server and restore a backup of the database, then edit ./inc/config.php with the new database credentials. Without knowing how much you know it's hard to give specifics.