My plan for the MS150 two years in a row was just ride as much as I could. Sometimes that would only allow 10-15 miles on a weeknight. The weekends I tried to get some long rides in to get my tushy used to that much saddle time. I would usually do at least one organized ride that is 76 hilly miles at the start of my training (Feb) and then try to get some 40-50 milers in at least a couple times. I felt exceptional after the first day of 90 miles. That ride is one that really makes you feel good about yourself (lots of cheering people along the route), so it may have helped me mentally.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan