How difficult or easy it is to trust someone? I don't know...i can't say, i can simply give a consultants' answer - "It Depends!"....Ask the same thing to a Mumbai local train commuter, and he might be in a better position to tell us...
I clearly remember seeing people who run after completely packed trains...some are successful in boarding it and twice the number are successful in loosing their lives in performing the marathon act...
Imagine, a person running after a train, that is about to cross the platform, running as fast as he can, suddenly raises his arms and people in the train reach out to grab him, with his feet dangling outside the compartment, half hanging outside, his foot somehow manage to find a spot for his frail body...what do you think, just happened? Hanging in the middle of no where, this man literally gave his life in hands of complete strangers...he trusted them without knowing them...It was not a miracle, it happens day in and day out...this is not unusual, its a commuter's routine...

Ask me the same question again - How long would it take you to trust someone? Answer would be same again - it depends!