Just chant the pure Holy Name under the guidance of the pure devotee of the Lord. Harinam cannot be chanted without direction from Guru. Guru is one who has seen the truth otherwise he is not Guru. He is a Con Guru or kangaroo. Don’t befooled by the name and fame of many so called Gurus. Again I repeat what Bhagavad Gita says. Guru is one who has seen the truth. He can give you complete guidance to realize the same truth. Hare Krsna.