I'll sell you my old Genki I textbook. I taught myself a year's worth of college Japanese classes with it (aced the tests it took the kids 2 semesters to learn). I have extracted all possible information and it's now propping up my PS3 so the heat vents aren't blocked
Protip: Learn Hiragana and Katakana first. You can do this in about a day or two. If someone tells you to learn survival phrases first, hit them with an open hand.