It's easy to self-teach reading Chinese characters (well, not easy, but simpler), but for verbal education there's no substitute for immersion.
My cousin is an "English teacher" (cough cough) at a small town in Red China. He's as white as I am, while his wife is second generation Chinese-American, but he speaks better Mandarin because of his training. However, her Mandarin dramatically improved when they moved because it had to. Their children are of course totally bilingual.
"you're a doctor.... and 27 years.... so...doctor + 27 years = HATORI SOHMA" - RoyalWing, when I was 27
"Al hail the forum editting Shooby! His vibes are law!" - Osaka-chan
I could still be champ, but I'd feel bad taking it away from one of the younger guys. - George Foreman