It is worth saying it's an extremely difficult language to learn because most people are not prepared for what awaits them even if they learned another language

It is worth saying it's an extremely difficult language to learn because most people are not prepared for what awaits them even if they learned another language before. Anyone can pick up how to read kana in a week or so, so it's easy to assume that you're almost there, and you'll be reading manga or whatever in no time. But it's just the beginning. The language is completely different. You must commit a huge amount of time every day and change the way you think. One must be mentally prepared to give up a chunk of their free time for the foreseeable future (years!), because it won't be easy. Also IME, you barely need to speak any Japanese to wander around Japan and read the signs (because they're all in English anyway). Definitely recommended regardless of language proficiency.