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Check out the book Levitation by Steve Richards, it is a giude giving various methods of instruction, but it aint easy. Plus you could get into various kinds of magick dealing with summoning spirits, some of which can teach you how to do this. See Summoning Spirits by Konstantinos.

Also, Aleister Crowley's instruction on Pranayama eventually results in this, see Gems from the Equinox, or Magick. Patanjali and/or other yoga sources mention it as a magickal power developed through various yogic disaplines. Again, see Steve Richard's book Levitaiton, and possibly his other book Invisability.

There are instant projection techniques. The basic Body of Light technique used by the Golden Dawn and Aleister Crowley, as given an many books on projection and magick, One simply visualises the double and then transfers consciosness to it. A few say to relax first, but not many. A variation of this is used by the Aurum Solis, as given in the books by Denning and Phillips.

Also the author Stephen Mace describes using a personal sigil for the purposes of projection, which causes this to happen instantly.

There is also the techinique given by Konstantinos where you visualise yourself filled with light, then transfer consciousness to this image and then separate, moving away. Plus he goes on to using this while stading, in the middle of various magickal operations.