You should book the service at least 15 days before the tour departure date. After you confirm your trip with us, you should be sending us a photocopy of your passport or your personal information. The personal information you provide must contain your surname, name, date of birth, passport number, nationality, and gender. Importantly, you need to pay 20% of the total price in advance for the domestic flight tickets and hotel booking and permit process. You can pay the remaining balance after you arrive in Nepal.