With my students I give them lots and lots of guided writing. Part of it is as simple as writing a lot but not toward anything. The mind floats. Then I help them see where the language has heat. If we do this a lot in class, students eventually relax into this writing practice and enjoy it. Even just that - writing pleasure without the anxiety of "audience" or "grade" or "success" - is a kind of impetus toward the unfamiliar.