Cisco devices authenticated back to AD

So for awhile now I've known that I need to setup up authentication for command line access for our routers and switches.  I hadn't bothered because, 1. We are a smallish shop, 2. I can easily memorize a 24 digit hexadecimal password, 3. I'm lazy.  I finally got around to it and used this article by David Davis to help me out quite a bit.  When you used this crib sheet however, you never were able to get to privileged mode with your supplied credentials.  I then found this article that layed it out nicely.  
-PC