Qualification of Guru
Guru means Sad-guru, otherwise he cannot take you back to godhead.
Secrets of Chanting
Brahma muhurta is the best time to chant. As the day increases, it becomes difficult to concentrate. Prabhupada says that 99% spiritual advancement depends on chanting only. So chant offenseless and attentively. Even a fraction of second should not be wasted.
Potency
Only by chanting hari-nama, one can go back to godhead. No need to do big-big things. Big posts can’t help.
Answers to all Questions
Don’t talk while chanting. Hari-nama can answer all your questions.
Chant as much as possible
16 rounds are nothing. Chant as much as possible. 16 rounds are minimum.
Enjoy Mangal-arati
Finish 16 rounds before mangala-arati so that you can enjoy mangala-arati.