Sounds like an awesome trip! I'd agree with everyone else in saying that as long as you are getting a good amount of time in the saddle before the tour, you'll be fine.

Also, if your schedule is based on making 100 miles a day your priority, then that should be enough time. But if your schedule is including sight-seeing as a priority, then you may find yourself making adjustments. I'd also recommend getting yourself introduced to some basic bike repair before you go on tour.

Enjoy the ride!