I live in Japan, so I had to learn Japanese.
I learned more in my home country than here because I can cruise by on the little Japanese I have. Hard to motivate myself to do more.
I immersed myself in youtube videos, NHK news online, watched Japanese movies all to customize my ears to the sounds. I used many textbooks. all on my own. no classes.
people learn in different ways, i found self study the best.
Trick is keep plugging away, keep going-you will hit a plateau where it feels like you can’t learn anymore but keeping going.
It’s totally possible, not that hard and enjoyable to use!