"The Llewellyn Practical Guide to Astral Projection" by Denning and Phillips is simply the best step-by-step set of lessons for learning this skill ever published. Over a quarter-million people are using this book to help them learn this valuable skill. If you want to learn how to project your consciousness onto the astral plane, you should use it, too.
First, as the book shows, this skill is natural. You do it all the time (in dreams, for example.) In a sense, it is more natural than walking. It is a skill you can develop with practice. Further, it allows you to have spiritual experiences on the astral plane. Plus, what you create on the astral plane creates changes on the physical plane. This is true magick Heal someone on the astral  and they will be healed on the physical. Create opportunities on the astral and you will have them on the physical. You can even experience sex on the astral plane for one of the most dynamic experiences you will ever have. And you can learn how to do all of this in The" Llewellyn Practical Guide to Astral Projection.
"But it is not only the information in this book that makes it easy to understand and use. The very design of each chapter — as well as the illustrations, photos, charts, etc. — make it easy for you to learn the techniques to consciously control your astral projection experiences. The book begins by showing you what astral projection is and what it is not, what can happen and what is fantasy. As a result, you will discover that astral projection can be safe, comforting, exhilarating, and fun. Then you will learn methods of being able to let your consciousness leave your body and safely explore the astral plane.
With this book in hand you can explore realms you've only dreamed of. Make your dreams a reality.