I met Tulsi of Nepal Sanctuary Treks in 1998 on my trip to Nepal. He has recommended to me while I was in Nepal (I arranged my own travel for that trip) when I needed to buy a ticket. I found him to be very helpful, knowledgeable, and a great person. We became friend and kept in touch. When I decided to arrange a trip to Tibet for five of us in 2000, I contacted him and he helped me to arrange a wonderful custom tour. He met or exceeded all of our needs. When we ended up leaving Tibet a day early, we called him and his brother showed up at the border right on time. To do that, he came up the night before so that he would be sure to meet us. Only someone who has crossed that border can understand what that meant!
I recommend his services and him as a person unconditionally. Feel free to contact me with any questions that you have. My phone number is 360-297-3480. I worked out of my home, so feel free to call anytime between 8 am and 9 pm PST. I would also be happy to answer any question by email.
Tibet is an amazing experience. I have arranged my own travel in a number of countries and feel comfortable doing so. Tibet is one country that I would probably not do it. It is best to work thorough a travel agent, especially one like Tulsi that can help with the rough spots.