Robert Monroe originally set up the Monroe Institute (www.monroeinstitute.org) to help others learn how to journey out of body as he did. He learned by trial and error starting when he had a spontaneous out-of-body experience. He had learned so much from those experiences, he wanted others to be able to do the same, hence the Monroe Institute and his 3 excellent books, Journeys Out of the Body, Far Journeys, and Ultimate Journey.
In his effort to help people achieve the out-of-body state, hemi-sync technology was perfected and utilized as support to achieve different states of consciousness.
The Monroe Institue has all sorts of classes and CDs. You can check that out.
Here is the guided meditation, Transforming Life's Challenges (www.monroeinstitute.org/product/transforming-lifes-challenges), guided by Linda Monroe. It is a wonderful nurturing, healing meditation. I highly recommend it if you are going through any kind of a difficult time.