We buy the flight tickets

Getting the flight tickets was the most stressful part of our preparation, but this was only the beggining... The fact that we would have to pay out so much money in one go really scare us, but it is what we have to do.
Firstly we looked on the internet to find out what we would have to do to buy the tickets, this was where, thanks to the blog of other travellers, we found the round the world tickets, they are just a block of tickets you buy together and the price vary depending on the route.
We also looked later in some travel agents. However we didn´t see any enthusiasm in them and we quickly forgot that idea. Even now we are still waiting for a reply from one agent :)
Finally we decided to look at the search engines of comparison sites (We had used them before once to book a  flight).
We saw the best value flight, it was better to buy each of the tickets separately than in one package.