if you're completely serious on learning the language (like to an advanced level) i'd say it's most likely worth it, though you are able to bring yourself to that level via self-study (using standard books and materials as well as free resources online). learning the reading/writing/listening bits can be done via self-study, but i'd say get a tutor if you really want to speak in japanese and bring that skill up to a pretty advaned level. if you're not really interested in speaking but more in reading japanese books/periodicals or watching japanese shows then probably self-study is the way to go
I see! Can you recommend me some Japanese resources if possible?
i don't have an extensive list seeing as i did japanese in school rather than self study, but the genki books are always good starters - they're comprehensive and written for university level and the two textbooks pretty much cover jlpt 5 and 4 (if you're interested in taking the exams). they have listening audios that tie in with the listening comprehension extracts in the books (if you buy them and don't pirate them that is) but you'd definitely have to use other resources to supplement your listening and speaking practice, so genki is 100% a good start.