A person who reproduces the visualization from his head to your head is a teacher, an acharya. The person who reproduces the experience from his being to your being is the Guru..
Life is a divine flow. The more river-like you are, the more you are in tune with life. But we have become stagnant. The Guru's whole work is to bring back the flow of life so that you start becoming joyous and utterly happy and blissful for no reason at all.
As you walk with the Guru, you walk in the light of Existence, away from the darkness of ignorance. You leave behind all the problems of your life and move towards the peak experiences of life.
It is an incomparable journey where the Guru leads you from the visible to the invisible, from the material to the divine, from the ephemeral to the eternal.