There are a great many organizations, with sometimes very similar, sometimes very different offers, and the range of offers on the market makes it possible to go all over the world. The growing success of this type of travel has brought new players to this market, which now numbers in the tens. To book your trip, most of the steps are nowadays done on the internet. They are done on average 6 to 7 months in advance, to make sure you get the program you want, without making any compromises. Some programs are more popular than others, and for countries such as the United States, where space is often very limited, don’t hesitate to get started as soon as possible.