All you ever wanted to know about how to chant japa …improperly :-) (4 min video)
Srila Prabhupada: My dear Lord, although You bestow such mercy upon the fallen, conditioned souls by liberally teaching Your holy names, I am so unfortunate that I commit offenses while chanting the holy name, and therefore I do not achieve attachment for chanting. (Sri Caitanya-caritamrta, Antya-lila, 20.16)
Watch it here: https://goo.gl/PMrWrF