In the old days, during our work in Egypt, the Great Pyramid was used for such an initiation. The Student would be given 'elixir' to stimulate the imagination. They would then be treated as if they had died. They were placed in a sarcophagus, a death ceremony was performed, the rites of death were carried out and the sarcophagus taken to the King's Chamber in the Pyramid.
There, the combination of the student's training, the elixir, the death rituals which were being carried out on the student, the energy of the pyramid, would all combine and precipitate the death experience.
The student would transcend the dweller, and be met by hierarchial guides, who would share their journey of initiation into Universal Consciousness.
The next day, the student that walked into the Great Pyramid, was no more and the Initiate would walk out.