Tibet's "prime minister in exile", Lobsang Sangay, says he was caught by surprise when the Dalai Lama last year handed him responsibility for the movement's political future.
The Dalai Lama, the 77-year-old spiritual leader of Tibetan Buddhism, announced last March he was retiring from political duties and upgrading the role of prime minister shortly before elections that were won by Harvard-educated Sangay.
The decision shocked many Tibetans, who see the Dalai Lama as the figurehead for the struggle against what they say is Chinese repression in their homeland, but the Nobel prize winner said he wanted more democracy within the exiled community.
Sangay, 44, who has never been to Tibet, is based in the northern Indian hill town of Dharamshala where many Tibetans have lived since the Dalai Lama fled Tibet after a failed uprising in 1959.
"When I ran for the election I always thought I was coming to Dharamshala to serve the Tibetan people, and work under the Dalai Lama," Sangay told reporters in New Delhi on Monday.
"But I never thought that he would give us the surprise by saying, 'You are on your own - take all the political authority I have, and fill in the shoes and lead the Tibetan movement forward'.
"It is one of the most difficult jobs in the world."
Since taking up the role in August 2011, Sangay has faced a big challenge over the scores of self-immolation protests in Tibetan-inhabited areas of China.
On Monday, he repeated his appeal for Tibetans inside China to not set themselves alight, but said the protests were a reflection of Chinese government policies.
"Since I took over the situation in Tibet became worse ... and given the constraints on any freedom of speech, Tibetans have unfortunately resorted to self-immolation," he said, adding that 40 of 49 such protests had resulted in deaths.
China blames the Dalai Lama for inciting the self-immolations in a bid to split Tibet from the rest of the nation, and insists Tibetans now have better lives due to Chinese investment.