I can't be the only one with this ambition now, can I?
I started studying more than 4 years ago, and it's been quite a bumpy ride; other than the Japanese itself, I've learned a lot about 'learning Japanese', most of which I really wish I'd known beforehand.
If anyone just happens to be considering starting this adventure, here's the most comprehensive guide I could find:
https://itazuraneko.neocities.org/learn/guide.html
I tested most of its advice first-hand and can testify to its effectiveness; there's also a plethora of resources to get you where you want to.
Feel free to ask me for specifics, I'll try to elaborate if I'm able.