Chanting before the deities, Tulasi and Sad-guru gives quick advancement.
1. It is best to chant in front of deity of Krishna, or Tulasidevi, but better than that is to chant in front of Sri Guru.
2. Our first and foremost duty is to chant 16 rounds, minimum!
Imagine there is a bomb in the room and you are trying to find an exit how to escape. We would try our best. Similarly we should chant our rounds in the same spirit that Maya is ready to attack, so we must try our best to surrender to Krishna.
Actually 16 rounds is nothing. Chaitanya Mahaprabhu said 64 rounds.
If by the tongue you chant Hare Krishna mantra and by the tongue you taste prasadam, you will be perfect, simply by executing these two things.
As soon as a devotee can chant the holy name and glories of the Supreme Lord, he certainly comes to the liberated position. Attachment for glorifying the Lord by hearing and chanting the holy name and activities of the Lord (Sravanam Kirtanam Visnoh) certainly brings one to the position where material contamination is absent.