I actually became an Intrepid Travel guide by going on an Intrepid tour myself! After a particularly bad day at work at my previous job, I made a comment in the pub to a friend of mine and somehow the next day we had both given up our careers, and a few months (and jabs) later we were on a plane to India.
Our travel agent had recommended an Intrepid Tour of India followed by one in Thailand, Cambodia and Vietnam. The leader on the Thailand part of the trip, Tini, completely inspired me and nine months later after returning back to the UK, I approached Intrepid to see if I had the skills to show people my home continent of Europe.