Uncle Al says:
The first thing to do, therefore, is to get the body outside your own. To avoid muddling the two, you begin by imagining a shape resembling yourself standing in front of you. Do not say: "Oh, it's only imagination!" The time to test that is later on, when you have secured a fairly clear mental image of such a body. Try to imagine how your own body would look if you were standing in its place; try to transfer your consciousness to the Body of Light. Your own body has its eyes shut. Use the eyes of the Body of Light to describe the objects in the room behind you. Don't say. "It's only an effort of subconscious memory" … the time to test that is later on.