Admittedly not about buying a car but selling a car. But it's the same process, though from the opposite perspective. There is tons of advice. I myself had multiple answers and the whole subject was discussed at length on at least 2 or 3 threads.
Do go and look, minnie. Also lots of comments re ANTS so that might also be a useful source of info. It's not difficult but you do need to go through it step by step. Some attention to detail and a willingness to commit time and effort would pay dividends.
Apprendre une langue, c'est faire un voyage différent chaque jour.
from Fle pour les curieux