Your dreams contain everything they need to succeed. In manifestation, it means the process of removing anything that is not harmonious to your dream. It might be an old belief that applies to all other situations except the one you're trying to create. With the help of contrasting experiences.
Refinement fills in the pieces.
Let's say you've decided to own your own home. Let's say, further, that your dream is to own your home outright, without needing a mortgage. It's a great dream, but there are lots of details missing. There are lots of details to be filled in, and the refinement process of manifestation fills them in for you. A friend will invite you to join him at a furniture showroom sale.