Australia flanker Michael Hooper feels the Wallabies have plenty left in reserve for bigger World Cup tests after opening their campaign with an underwhelming victory over Fiji.
Pool A rivals England and Wales must have been pleasantly surprised as Australia failed to complete a bonus-point victory against Fiji in Cardiff on Wednesday, despite taking a commanding 25-3 lead three minutes into the second half.
Fiji dominated the second period but eventually lost 28-13 and Australia rarely looked like scoring a fourth try to match England's bonus point against the Pacific Islanders.
But openside flanker Hooper said: "You have to build, you don't want to show all your guns in the first game.
"You've actually got to get combinations going and confidence within the group.
"We've got belief in training with what we've done x amount of times and now it's about building confidence in games.
"We'll take a lot from that because Fiji put up a really good performance in all facets of the game, they took it to us in the set-piece and were throwing the ball around nicely.
"So what better way to start and I couldn't be happier to get a win against a tough team."
Australia coach Michael Cheika has promised to change his entire team for their next game against Uruguay at Villa Park on Sunday with only a four-day turnaround between fixtures.
But Hooper said that would not affect the Wallabies' build-up ahead of their defining group games against England and Wales at Twickenham.
"This is my first World Cup so this (rotation) is relatively new for me," Hooper said.
"The coaches have got to decide how they get through these first two games, but whoever we put out next week will be a really solid team.
"We knew we had this coming and that's why we've got two teams in the first two games."
And Hooper insisted that Australia would not even focus on their showdown with England on October 3 before getting pool minnows Uruguay out of the way.
"It's about week to week for us and focusing on each game," Hooper said.
"We'll look at the Fiji game and see what we can take from that into Uruguay.
"We won't think about England until we get Uruguay out of the way and review that one then.
"But I think we've had a great first set-up for us in all facets of the game.
"Fiji have done really well in their opening two games and I'd imagine they'll give it everything against Wales next week."