If in NYC, go to any dhoti ticketing agent and ask them to book you a ticket to Delhi and a connecting flight to Bagdogra (not Guwathi Airporti...apologies earlier). The agent would also be able to work on you Indian visa. When you get there, look and dress poor...No need to impress anyone and no need to be friendly with any strangers otherwise you just won't make it to Ktm. Getting back to the topic,from Bagdogra, share a cab with someone to Kakarvitta and once you reach the border if any questions, let them know you're coming from Siliguri/Darjeeling. In Kakarvitta, there are hundreds of night buses waiting. Just hop onto one but becareful of your valuables as I know a lotta peeps who have been robbed on the journey into Ktm (act and dress poor especially since you're travelling alone, aight??).