"O best of the Bhāratas, it is the prime duty of persons who want to become fearless to hear about the Supreme Personality of Godhead, Hari, and to chant about Him and always remember Him. Lord Viṣṇu is always to be remembered; indeed, He is not to be forgotten for even a moment. He is the sum and substance of all regulative principles." The conclusion is that when all the rules, regulations, recommended and prohibited activities revealed in scriptures are taken together, the remembrance of the Supreme Lord is invariably the essence of everything. Remembrance of the Supreme Personality of Godhead within one's heart is the goal of devotional service. When devotional service is performed purely and affectionately, there is no question of regulative principles. There are no do's and don't's.
However, one should generally accept the following principles to properly execute devotional service: (1) take shelter of a bona fide spiritual master, (2) receive initiation from the spiritual master, (3) serve the spiritual master, (4) inquire and learn love from the spiritual master, (5) follow in the footsteps of holy persons devoted to the transcendental loving service of the Lord, (6) prepare to give up all kinds of enjoyment and miseries for the satisfaction of Kṛṣṇa, (7) live in a place where Kṛṣṇa had His pastimes, (8) be satisfied by whatever is sent by Kṛṣṇa for the maintenance of the body and hanker for no more, (9) observe fasting on Ekādaśī day (this occurs on the eleventh day after the full moon and the eleventh day after the new moon.