I can echo what everyone else on this board says. A couple of pointers:

- You have only one year to complete your itinerary.
- You have to go from continent to continent in one direction around the world. Depending on your origin point among other factors, some continent hops may be impossible.
- From experience, you'll get mighty sick of traveling after a while. Consider doing maybe two trips, 6 months or a year apart, if you want to get around all those places. Do 3 continents on one ticket, 3 on the other...
- You definitely need a TA