Easiest is sravanam (Intro to BG As It Is)
Hare Krishna Friends,
The nine processes, of which the easiest is sravanam, hearing Bhagavad Gita from the realized person, will turn one to the thought of the Supreme Being. This will lead to nisala, remembering the Supreme Lord, and will enable one, upon leaving the body, to attain a spiritual body which is just fit for association with the Supreme Lord.
Source: As It Is by HDG. A.C. BhaktiVedanta Swami Srila Prabhupada