Hey Beth,
Please try some short term trips before you hit the road for the Continental Divide. A weekend camping at home has been a good start for many. Gives the chance to find out how things work, duck inside for the canopener you forgot, so on and so forth. Then a local state park or the like.
Also make sure you know where all the service points are on the Toyota and the House. Like Oil, Water, Tires (be sure about Rear Duals to check the air), Chassis and House Batteries.
Do you have an onboard Generator? If so, do you know how it operates and how to power the House from it?