Because you are a non-native English speaking Japanese studying English on your own time, you already have part of the main problem solved. Passion for the language will help anyone learn at a good pace. In learning a second language I think that consistency and practice are the most important things to maintain. Practice, and practice regularly. Even 20 minutes a day is good. I try to learn at least one new word every day. If you can find a native speaker and practice then you are doing VERY good. Even if it is difficult, language partners understand that it is not easy to learn a new language. Example: Sometimes I am embarrassed by my poor Japanese skill, but I will not improve if I do not try to speak with Native Japanese speakers. I can learn many words and kanji, but I want to learn how to speak like a Japanese person. がんばる　みかーさん。えいごはむずかしいよ　でも　きみの　あたまごいいですよ！

For you to improve your learning language skill you need to have as many conversations with English speakers as possible. Have them criticize your conversations and offer suggestions for you. Also keep memorizing vocabulary words, by reading reading books to yourself and out loud; look up all words that you don't understand in the dictionary. Try and surround yourself with as much English culture as possible and ask questions about curious things that find worthwhile and meaningful with your language exchange partners. But most important to remember is that you should always have fun while learning the language. Good luck!!! It is all about reinforcing what you already know and then building upon those skills.

study, practice, study, practice :P

Make English speaking friends and talk live on mic.

Learing English is very difficutl to asian people because everything is different. I think you are doing good. You can probably make some good friends who can speak English very well. If you have any questions, you can ask everyone in this website. I think many people can answer your problems. You can learn one by one. As you can see, there are many mistakes in my English writing. However, if you don't try to write in English, your writing skill will not be improved. Don't be afraid of being mistakes. You can improve your English by your own mistakes. Good luck!