[NightBird]

So the real hard point is Kanji and the writing part of the language...
But about speaking, well I agree this is not hard...

Well, I don't really live in France but in Belgium, but I may move first to France soon so...

In my country, some schools do courses in the afternoon (average time in course: 4 hours) of English, Spanish and ...
Is this kind of courses in Japanese will be enough if I take like 2-3 hours/day, 4-5 day/week?

And If I understood, the "Kanji" is the Chinese/Japanese "alphabet-like" and Katakana and Hiragana are used especially for syllabes?

Thank you for your answers! And yeah I'm only 17 and I'm not going to work directly because I would like to make superiors courses (bachelor + master)
I suppose that the europeans diplomsa are valid in Japan?