"According to occult teachings the astral plane can be visited consciously through astral projection, meditation and mantra, near death experience, lucid dreaming, or other means. Individuals that are trained in the use of the astral vehicle can separate their consciousness in the astral vehicle from the physical body at will."(Alice Baily)
This is a pretty acurate description .
Though it is a process,you can with practice be taught to AP and experience a wide range of things in The Astral Plane