@hakan_geijer ok, so they said they don't know enough to tell you about going end-to-end, but it might be worth getting a guide.
You'll be OK~ with just French most folk are very friendly and helpful, but Arabic would also be helpful as many poorer people don't speak good French. Beware of bandits (hence the guide).
There is a lot of good food if you're vegetarian, they ate unsure about vegan food.
As for maps, you'll maybe get by if you're very experienced, but again, get a guide. Also, don't neglect having a paper map, solar can be plentiful, but then sometimes it isn't, so you shouldn't expect to always be able to charge your phone.
If you've got more questions i can pass them along.