Only now, after 2/3 years of independent study through textbooks am I starting to practice communication skills. Because I'm going to Japan in September, I want to have more a practical knowledge of the language than I currently have. After trying to practice speech for the first time, I immediately noticed that it is very difficult to pick sentences apart when spoken by a native speaker, if you're just accustomed to reading. Very often, I'd have to ask them to repeat what they said slowly, and ask what some words meant. It's even more embarrassing when the words I don't know, are ones I'd recognize immediately had they been written down in kanji :banghead:.
I am VERY much more adept at the written language than I am in the spoken language, and it might take a while to balance back out. However, I'm happy I've taken the time to learn all kana, hundreds of kanji, at least a thousand or so words, and lots of grammar, because they'll greatly help me out as I continue to improve my conversation skills. I guess if you want to be proficient in Japanese as soon as possible, it is important to exercise all skills from the start. However, I think that a strong foundation in the basics of grammar will benefit you greatly when you start to immerse yourself in the spoken language. If you don't learn fundamentals right away, the language becomes just a sequence of disjoint facts that you have to memorize, with little connection between them. If you master basics of grammar first, when you start to learn more of the language, you'll immediately have a much deeper understanding than otherwise. It also makes it easier to learn new things, because you can always resort back to fundamental rules to make sense of things.
However, the method I'm learning is by no means the ultimate approach. I think a lot of it depends on what kind of learner you are. I am a very logical person, with a strong foundation in math, physics, and computer science, so learning a language from fundamental principles worked very well for me. In my case, I think it was best that I learned kana and kanji recognition through
LRNJ first, then grammar through this site
http://www.guidetojapanese.org/index.html second. After that, I got textbooks, and progressed fairly rapidly through them, picking up what vocabulary I could. I'm now at a stage where I can read material from 2nd or 3rd year university courses, but can only make it through a 1st year conversation :hehe:. Again though, I didn't really have access to any formal lessons, so I was kind of forced in this direction, and as such, probably have a very biased opinion about the matter.