Since Bob Dylan has been honored with a Nobel Prize for Literature, we may as well welcome the man into the community of those practiced in the art of belles lettres. Good to have you, Bob!
Here’s some advice from Mr. Zimmerman contained in Paul Zollo’s Songwriters on Songwriting, which could apply to most any writers:
It’s nice to be able to put yourself in an environment where you can completely accept all the unconscious stuff that comes to you from your inner workings of your mind. And block yourself off to where you can control it all, take it down…
If you follow his often stream-of-consciousness lyrics, that approach makes sense. It’s harder to do, of course, than it sounds. Be open to the muse, but direct it.