Learning a language?

OK, what is the best method for learning a language? The precise language is French, but a more general method would be great as I will be living in Belgium and need Dutch and German in the next few years.

I have the basics down, am enrolled in a local language course (quite basic, but hey), and have a grammar book. Any more tips?

I hear Dutch is the easiest language to learn for English speakers? Is this true?