1/2 Marathon to Prepare for a Future Marathon? I am thinking about it

So I have run a marathon, and am getting the itch to do another. I haven't fun a half-marathon, and i think it would be both cool to do one, as well as a good building block for preparing my mind and body for the thought of a more grueling marathon. As I have stated, I would love to run the Kentucky Derby Marathon...maybe even this year. I am considering using this half-marathon training plan. It includes 35 miles a week, and plenty of speed and fartlek workouts. That puts me on pace for a Feb 25th 1/2 Marathon. Interestingly, Sean, that puts me in the same weekend as the Hyannis half-marathon. Anyways