While England has been a favorite since entering the tournament ranked No. 1 and has won 21 of its last 22 tests, the Australians had a mixed preparation.
The Wallabies lost to England in Australia for the first time in June, going down 25-14 to extend a losing sequence to the English to four matches, then lost to South Africa and twice to New Zealand.
The form was scratchy in the pool stages, struggling in a 24-8 opening win over Argentina, thrashing Romania and Namibia and struggling for a one-point win over Ireland.
The Wallabies had a tough time against Scotland in the quarterfinals, winning 33-16 despite conceding a glut of possession through handling errors.
Gregan admitted the Wallabies were most nervous before the quarterfinal, because it was the start of the knock-out phase.
After heavy criticism of its performances against the Celtic nations, something clicked against New Zealand and the 22-10 semifinal has silenced the critics.
"You feel responsible every time you wear the Wallaby jumper. You're representing each other and obviously your country," Gregan said. "It's obviously at a stage now were the whole country is right behind us."
He said there was composure in the squad this week, although it had been restless ahead of the quarterfinal.
"Once you get in there ... you've done the preparation, you've put yourself in the position, it's just a matter of backing yourself and being confident and positive," he said.
"That's where we are at the moment -- the team has a quiet confidence."
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