1. Daydream. It gets the juices flowing and provides a continual source of amusement throughout each day. Remember the heroine of Daphne du Maurier's Rebecca? She daydreamt so much that at times she couldn't tell dream from memory. That's the goal. (In addition to daydreaming during waking hours, try daydreaming yourself to sleep at night. I know it really easy to just think about projects and stress about daytime worries, but try this instead and see where you end up!)
2. When you do dream, write it down or at least tell someone. That helps you remember, but also boosts your dreamability confidence.
3. Set an alarm to go off a couple hours before you plan to rise. When you go back to sleep? That's prime dream real estate.
4. Don't drink too much. You'll just sleep too hard to dream at all.
5. Read lots of books.