Led by her back-to-back player-of-the-game performances Australia swept Japan last month, winning 34-5 and 46-3, and with more Test rugby under their belts and increased professionalism in their preparation Hamilton is adamant her side is capable of springing an upset.

Her side takes to Optus Stadium on Saturday afternoon before the Wallabies face the All Blacks.

"We've had that opportunity to spend that time together, so for us this is the best preparation we've ever had and I can't wait to get out there on Saturday," Hamilton said after touching down in Perth earlier this week.

"Having that cohesion in our group and having that time together we obviously work each other out and learn how to play together. Moving into this Test match it is so important for us to keep building and keep improving."

Although she's confident her side is well-placed to knock off the world champions, there's no doubt the Black Ferns' record against her Wallaroos is an imposing one.

Australia have lost 17 consecutive Tests to the Kiwis and were beaten 31-11 in Sydney last year before being handed a 45-17 defeat in the pressure-cooker atmosphere of Eden Park.

"They've always been dominant, it's in their blood," said Hamilton of New Zealand.

"They spend a lot of time together. I think we've built that belief (we can win).

"We've got to keep building and we want to take every opportunity we can. It's not about getting our heads down or heads up, it's about continuing that momentum throughout the game. We're excited to get out there and play some good rugby."

Hamilton said once again being able to play a double-header with the Wallabies is huge, and naturally Rugby Australia will be hoping a big chunk of the sold out crowd for the men's game will be on hand to cheer the women's outfit too.

Last year's Sydney Test was played in front of 28,846 people, the crowd setting a new world record for women's international.

"To be here and part of the Wallabies environment is amazing for us," Hamilton said.

"It's a great rugby community here. Everyone is involved and everyone wants to be involved in rugby."

Hamilton is expected to once again line-up at No.8 for Australia, where she produced two monumental performances against Japan.

In the second Test against the Cherry Blossoms she scored a hat-trick and ran for more than 200 metres to boot.