Avoid trying to do it all in your head. Once a week, write out your visualization and be as detailed as possible. What are your thoughts? How do you feel? What do you see, hear, taste and smell? It's worthwhile to read your visualization aloud at least once a day. The more senses and learning modalities you use, the better.
Imagine your dreams coming to life. Read them like a story to yourself, and read aloud so you hear them, too. This is much more effective than just occasionally daydreaming about your goals.