Sign up and register your game on the paradox forums to gain access to the modding section. Then go here:

http://forum.paradoxplaza.com/forum/...A-Balansegang)

The mod's maker, Meneth, has included fairly straight forward instructions for installation as well as a general (ie huge) feature list at that link. He updates like crazy so it's best to grab the latest stable version and ignore updates for the rest of your gameplay. Otherwise you'll be patching every other week.