*Watch "Gareth Jenkins: Into the Fire", Thursday, 6 September, BBC One Wales, 2235-2315 BST
BBC Wales' cameras followed Jenkins for 12 months
Wales coach Gareth Jenkins admits fears over his position in a revealing BBC One Wales documentary "Into the Fire," (Thursday, 6 Sept, 2235 BST).
"Halfway through the Six Nations, there were times I was thinking 'well I wonder, you know?'," said Jenkins, who is 16 months into a two-year contract.
"If the Welsh Rugby Union felt I wasn't performing and I wasn't successful they could have easily ended my contract."
But Jenkins says he is now determined to get at least four years in the job.
What would really kill me was if I wasn't given an opportunity longer than two years
BBC Wales' cameras followed Jenkins in the crucial 12-month build-up period to the World Cup, the former Llanelli and Scarlets coach entering the tournament with a record of just four wins from 16 games.
Pressure has mounted on Jenkins in what he has called his dream job, supporters dissatisfied with the lack of victories.
Although he admits to feeling the strains, the coach wants to be in the job for the long haul.
"You come home from work and really you take work with you," says Jenkins.
"There was a feeling in my stomach for two days after the Scotland game [in the Six Nations], it's hard to explain, but I think you've really got to be at the top end of sport to fully understand where your stomach churns.
"It doesn't churn every minute of the day, but there are moments where you go back to the rawness of the moments that really were unacceptable to you. You just don't sleep.
"What would really kill me, what would really knock me back, was if I wasn't given an opportunity longer than two years.
Coaching in Wales is probably one of the most difficult jobs in world sport
"I don't think in two years you can affect anything. If I was able to look back after four years I could then say to myself: 'You had your opportunity, you were given the chance, have you made a difference?'"
Jenkins finds support in the programme from England's World Cup winning coach, Sir Clive Woodward.
"Coaching in Wales is very, very difficult," said Woodward, who Jenkins assisted on the 2005 Lions tour to Australia.
"It's probably one of the most difficult jobs in world sport, just because of the amount of pressure you are under.
"If you win you get a pat on the back, if you don't you get shot."