HIM Training Plan

Hey guys, I'm pretty excited to post in this forum.  Throughout this year I always lurked in here to see what the crazy people are doing!  You're all a huge inspiration.  Well, I signed up for Timberman 2009.  I just finished reading through the free 20 week HIM plan.  It seems very detailed and well thought out.  Periodization, specificity, and nice balance of workouts.  Have any of you used this with success?  My goal right now is to beat 6 hours but I feel confident with hard work I can break 5:30.  Will this get me there or should I look into a coach, silver membership, or something else?

Background:

I'm 32 and started training (and racing) for tris around February of this year.  I used to be into team sports like basketball, football, etc but blew out my knee (ACL reconstruction) and almost did so again this January.  I have since retired!  My buddies can live without this old man!  I completed two sprints (1:05 & 1:14) and an olympic (2:46).  I've sought out some swimming lessons and am getting better.  Though, during regular training I still only average about 1:45 per 100 yards at an RPE of 4-5.  RPE of 7 I'm at 1:30.  Biking is my other weakness.  I averaged 18.5 MPH at my olympic.  That's pretty fast for me.  So, I suck on the bike.  Running is my strongest discipline though I'm still slow.  I did a half mary in early October in 1:44.  Not fast but better on average then the other two disciplines.  All in all I try and spend time like this Swim 20%, Bike 50%, and Run 30%.  I used to lift a lot but I am cutting it out next year.  I'll do some pullups and pushups when I stretch but nothing heavy.  While I do feel it helps the physique I don't feel any faster and always seem to get hurt.

I'm training for the Boston marathon starting in December and as soon as that's over I'll jump into the HIM plan and sprinkle in some sprints and olympics over the summer.