To convert an ordinary human into a great Vaishnava he has to just follow only one rule (niyam) “always (continuous, sataat) LORD KRISHNAS MEDETATION (chintan) & NEVER EVER FORGETFULLNESS.”
This is very easy for devotees by birth or birth in the house of devotee. And which is very difficult for ordinary ones? & to develop we have to follow many niyamas .Of this first is chant, listen, remember & spread the holy name of lord Krishna.
RADHEY RADHEY