Sportal.co.nz 12.Sep.2012Getty Images
Barrett, 21, has made only two Test appearances, both as a substitute, but he relishes every chance that comes his way.
"I'm excited," he said. "I can't wait for the weekend. It's a big test for us. The 'Boks are hungry for a win after a draw and a loss on tour."
Beauden will almost certainly be on the bench, behind Aaron Cruden, but he is doing everything possible to ensure he is ready if the call comes.
"It's just about knowing my role well and preparing to play. That's all I can do. It would be pretty cool to get a chance against the Springboks, especially here.
"The South African players are always very physical in the Super 15 and they're always great encounters."
Barrett said the All Blacks had to be prepared for different conditions, as well as different opposition, after their battle in the wind against Argentina in Wellington.
"The conditions in Wellington weren't easy for anyone so this week under the roof will be a bit different," he said.
"The tactics will be different and it will be easier to use our skills so I'm sure Aaron (Cruden) will go well this week. I'm sure there will be a lot of running rugby so it should be a good spectacle."
Barrett said it was a plesant surprise when the All Blacks' training on Tuesday was switched from Carisbrook to the match venue at Forsyth Barr Stadium because of the wet, bitterly cold weather in Dunedin.
"I was pretty pleased, quite excited about training here. It's a great venue."
Barrett has played once previously at the stadium when his all-round play and goal-kicking were key factors in the Hurricanes beating the Highlanders.