I studied using TTMIK via Memrise for about 6 months. While doing that I also took a few grammar lessons here, and even more "free-talk" lessons. Now I don't really "study" anymore. But that's just because the language has become so familiar, as I use it every day. I also try to think in it, but for now it's mostly simple sentences.
Also, this might be a cliché, but I try as much to live the language - to get the feel of it and its identity - and not simply just learn it.