Obedience
If you follow exactly what Guru says, Guru will protect you from maya.
Attitude of a Disciple
Remain a fool before Guru. Do what he says. Then see the result.
Inquiring Properly
After the disappearance of Guru, there is trouble. So the disciple should inquire properly till Guru is physically present. He should inquire about his field of work and the way to do that.
Secret of Success
Strictly follow what Guru says. Don’t commit offense towards the vaishnavas, and then, sure, in one life, you will go back to Godhead.