Get films in the language and watch them with subtitles (in that language). Read novels as soon as you can. This is hard to start off with, stopping every couple of lines to look up a word, once you get down to 2-3 words a page that you don't know then start reading without a dictionary, skipping words you don't know (humans are great at interpolating meaning). Just those 2 get you half-way to fluency. For the rest, I think you really need immersion.
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To start off you might want to use subtitles in a language you can read, otherwise you're just going to be utterly confused for a couple of hours. If you do this, you do have to force yourself to pay attention to what they're saying though.
Good advice, just a small addition: if novels are too hard, give comics a try.