Flex your muscles and then loosen them. Start with your toes and work your way up your body, gradually making your way to your head. Make sure every muscle is completely relaxed when you are through.
Breathe deeply and exhale completely. Don't hold tension in your chest and shoulders, just relax.
Focus your mind on your breathing. Don't get carried away with thoughts of outside worries, and don't get preoccupied yet with the idea of your soul projecting from your body. Just let yourself sink into relaxation.
It can be helpful to use a quartz crystal to raise and speed up your vibrations as preparation. Gently hold the crystal on your third eye slightly above the centre of your eyebrows with closed eyes and breathing deeply. Feel the vibrations and your head clearing; you can envision golden, white, purple or any colour light if you like. During the meditation and astral travelling you can hold the crystal in your hand or place it on your chest or abdomen. The crystal will empower and protect you because of its high vibrations; negative energies have lower vibrations.
Focus on the body part until you can visualize it perfectly, even with your eyes closed. Continue focusing until all other thoughts fall away.
Use your mind to flex your body part, but do not physically move it. Visualize your toes curling and uncurling, or your fingers clenching and unclenching, until it seems as though they are physically moving.
Broaden your focus to the rest of your body. Move your legs, your arms, and your head using only your mind. Keep your focus steady until you're able to move your whole body in your mind alone.
Examine an object in the other room, something that you had never noticed before in the physical sense. Make a mental note of its color, shape and size, paying attention to as many details as possible.
Return to your body. Physically go into the room you previously projected yourself into. Walk to the article you examined during the astral travel. Can you confirm the details you noted when you explored the object with your mind?
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Explore further. During subsequent astral projection sessions, go to locations that are less and less familiar to you. Each time, note details that you had never noticed before. After each session, physically verify the details. After a few trips, you will be experienced enough to travel to locations that are completely unfamiliar with the confidence that you have actually performed astral projection.
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Return to your body. Some say that astral projection is dangerous, especially when one gets enough practice to explore unfamiliar places but it need not be. Those people simply don't understand it or fear it because they don't use enough protection, as long as you ask for protection in your own way it'll be a good experience. Before you astral project it is nice to imagine yourself bathed in a glowing, white light. Imagine it as a cloud around you or inside you; this will protect you from other thought forms or negative energy forms.
There is so much to get into, but know that no harm will come to you unless you think it will. The thrill of having an OBE keeps some people out of their bodies for long periods of time, which is said to weaken the silver cord but the silver cord cannot be weakened. It is pure energy and energy can't be eliminated or removed, only moved from one place to another, or one form or another so don't worry about astral travelling; it is natural, powerful and healing.
Some say that demons can inhabit the body while the soul is being projected. If you fear this may happen, protect your body by blessing the room with a prayer before you perform projection. It is only hearsay anyway and seeing as you'll have already asked for light protection nothing bad will occur.