I taught myself Mandarin and found it quite do-able, especially reading it whereas speaking it is harder. Then I tried learning Japanese and gave up. I think you need to know more about Japanese culture and the unspoken meanings to really get the hang of it and use it correctly/politely. All I now can remember of Japanese is ‘maramoto’ (? spelling) which means ‘cute little thing’ and is Japanese for ‘guinea pig’ and ‘chrissimassy cakeo’ which, you’ll never guess, is Japanese for ‘Christmas cake’! I try to imagine myself visiting Japan and trying out my language skills - walking into a hotel and talking to reception by improvising with my only vocabulary - ‘Maramoto, (greeting with a polite bow). Chrissymassy cakeo? (pronounced with accompanying hand gestures so as to convey ‘do you have a room with view of the sea and en suite?’)’ I imagine being politely but firmly shown the door! Ha!