Visual Methods
*Projection; This term means in a shortened way "projecting your consciousness into an inner dimension of awareness (or astral plane)".
The projection method described below worked for me in the morning between brief sleep sequences (for instance on Sunday mornings until 9 or 10 o´clock).
The method seems easy to start, but difficult to develop to the desired degree of body awareness in a 3D-world.
Method
For better understanding let us consider "tiredness-pictures"; There is a special kind of inner pictures, called "tiredness-pictures" (because you can see them when you are relaxing in a state of being tired).
This kind of inner pictures you certainly have already experienced.
*Example; You have gone many miles for many hours. At home you fall into a comfortable chair in order to have a nap. At the moment you close your eyes, you have the movielike sight of roads, and you seem to glide along.
Perhaps, if you are explorative, you try to manipulate these pictures.
With some attention and concentration you are able to extend the duration of the inner movie and simultaneously you can focus details and gain three-dimensionality..
The same kind of inward directed concentration you can use as method for astral projection, when awaking between brief sleep sequences in the morning (at this time you have a better concentration as in the above mentioned case).
Being refreshed enough to have good concentration, you still have a remainder of ability to produce inner pictures.
Try to visualize an inner movie, like sliding through a landscape or along a road. Everything now resembles a flying dream. If you have succeeded so far, try to stop the impression of being moved (passively) and try to stand on your feet.
If you do this, the "movie" converts to a 3D-space world. Hold an object with a fixed gaze, until you perceive every detail of it (to increase concentration).
Then grasp any object and try to feel roughness and structure, to become aware of full touch-perception (and to have a good bodyfeeling).
Tunnel Method
In a state of deep relaxation imagine to enter a tunnel or cave leading to a tunnel (or similar imaginations).
Now you pass the tunnel with your attention directed on bodyfeeling and vision.
The tunnel usually stays dark for a long time, but nevertheless all becomes more and more realistic to you. At last you see a light as a sign of the end of the tunnel. When you leave the tunnel, you are in a realistic felt new world. This is a preferred method in shamanism.
It is as well a method, which is recommended to be performed in a "half-sleep state", a state at the end of the REM phase.
You can consider the tunnel transition to an other state, here an OBE-state, as a very natural thing. At the border of awaking you may occasional have a dream, in which you pass a tunnel. As dream symbol the tunnel belongs to the category of border symbols (a border between two states). Further tunnel observations very often are reported in NDE´s