The wife and I are running a TM in a few weeks. I signed her up before she got to watch the videos, hehe... But shes excited to go. We're far from athletes but we both run 7-8 mi/week and I do a lot of strength training. I'm sure we'll survive and expect to have a lot of fun doing it.
You'll complete it easily! I signed up for the Central Florida Mudder with a bunch of family tonight, including my wife! It'll be her first. She is vertically challenged at 5'2", but we'll get her through it!!