Unlike most people here, I believe in training for a tour. Especially if you have limited time available or specific daily mileage goals.

For me, training means fast 45-60 minute rides during lunch 3-4 times during the work week and longer rides on the weekends. As I get closer to the start of the tour, I switch from my road bike to my touring bike and start adding gear to my luggage. On the weekends, I work toward doing long (4+ hour) rides on back-to-back days over terrain that mimics my intended route (ex: if the tour involves hills, I make sure to do some climbing). Again, as I get closer to the start of the tour I switch to my touring bike and start adding gear. For the last 2-4 weeks before the tour, I ride the touring bike pretty exclusively and have it packed with 70-100% of the gear I plan to take. On most training rides, I push myself to ride a bit faster than I normally would during the tour itself and I take fewer/shorter breaks. I also don't hesitate to take a few days, or a week, off so that I don't end up over-training.

By the time the tour rolls around, I've got everything sorted out with the bike, have a very good idea what my average pace will be, and can simply relax and enjoy the riding...