Please refer to this one, it has more information concerning this.
http://www.thejapanchannel.com/Learning-Japanese/4117-Self-taught-Japanese.html
Oh, just a quickie here, as Mai in that thread said; I must agree a very nice source is Tae Kim's grammar guide (
http://www.guidetojapanese.org/learn/grammar )
It WILL teach you well, and I personally love it, since it has been really hard to find a source that is as good or better than this.
Another source I would recommend is meeting a japanese person online. The only problem is finding them, lol