Join a class
Either take classes both in and out if school or go to the country and plunge right into the deep end, you'll end up having to learn the language if you can't survive without doing so.
I think I'd try immersion. I'd like to spend a year in Mexico learning Spanish, but due to budgetary restraints...
I learned Spanish in school. You can buy "Rosetta Stone" if you want to learn on your own, or take classes at a local community college or whatever.
I took course class
One word at a time, ten thousand times.