I'm not in the good-looking category (good hygeine and fit, but approaching fugly), and around the eikaiwa, it was nearly impossible NOT to get hit onm, and by some very beautiful women. Outside of that environment, I was a joke. A couple of years of serious humiliation ensued.
Since then, I've honed my Japanese to the point where I can speak at a conversational level, and, because I'm exceptionally witty, I can joke and flirt pretty well. Now I can easily meet half a dozen women of all ages in a day, and get their numbers. Out of those, perhaps two will screw me senseless. The difference is in the language skills, the fact that I have a lot less emotional baggage, and the fact that I no longer give a fuck.
Expect to spend at least two to three years of hardcore study to learn the language though. It ain't easy.