No need to go back home. when u fill your first letter they will ask where u want to be interviewed and ask for Toronto or wher ever and will be straighten out. Its very simple and they are real co-operative unless those nepalese people working in US Embassy in Nepal. They are most idiots (including the guards and that Grey haired Khetri Chettri guy in visa section) but the girls in the main door are nice though..wink..wink