It comes naturally with an open mind to possibilities. Your mind has safety system built in so as not to expose you to alien situations. But as you think and accept about diffrent possibilities, the mind gradually opens up to link itself to the universal consciousness. It does not happen overnight anymore than a child can understand complex structures and meanings without the knowledge behind it. It frustrates a lot of people who can say that I have a masters in so and so, why can not I understand the higher functions?
Just as our neural pathways are formed at childhood for pattern recognition and understanding, so the next level takes time. And just as a child can get hurt with wrong activities or understanding, so can the new information cause confusion if not assimilated properly. I think, we are better prepared to handle such new information than our ancient counterparts - since we have more detail knowledge in science and technology. Without a full understanding of physical laws and science, it is difficult to use the new capabilities. Imagine a laptop in the hands of a person in 5th century...or understanding of lever principle to move a large object.
In my case, when I projected myself to the galaxy, I was on a chaise lounge outside in a spring night looking up at the stars. Suddenly my body felt very light and up up I went. I thought, it was cool. At the time, I thought it was just a dream until I saw the picture of Earth in Life magazine. Many years later I saw the pictures from Hubble Telescope that matched like a deja vu.