I used his Novice 2 program for the 2013 WDW Marathon - my first. It seems like you are looking at the Novice Supreme. In my opinion, since you have already done 4 half marathons this year, is to do his Novice 1 or Novice 2 program instead. I had done no halfs when I started (I did two during the course of training) but was running about 20 miles/week, and I did fine. (Of course, I got the flu before the marathon and spent a few hours longer on the course than I had ever imagined, but I was trained and able to finish). I switched mine up - he had short runs on Tuesday/Thursday, medium run on Wednesday, and long run on Saturday. I did - medium run on Monday, short run on Tuesday, short run on Wednesday, long run on Friday or Saturday.