The Hawks have made another excellent start to the season, including Saturday's 145-point demolition of St Kilda that gave their percentage an almighty boost and carried them back to the top of the AFL ladder.
Bookmakers have installed Hawthorn as heavy favourites to make it seven wins from eight starts this year when they head to Sydney to take on the Swans.
But the Swans have put together a three-game winning streak, including a 79-point belting of the Brisbane Lions on the weekend, and Jack seems quietly confident about their prospects.
"I think you've got to focus on your own process and structures," he said.
"Their foot skills are good, but they're only as good as you allow them to be.
"Our pressure, it's a cornerstone of our game, and our pressure will dictate how well their ball use is.
"We've improved and the weekend was pleasing and we had a pretty comfortable win in the end, but now it's a test.
"We're pretty confident in our form, we've got back to some things we've reaffirmed that we're good at, now is the ultimate test to see where we're at in terms of where the competition sits."
The Swans have been boosted in their bid to knock off the reigning premiers by injuries to key Hawks Sam Mitchell (hamstring) and Brian Lake (calf).
Mitchell will be absent for eight weeks, with Lake set to miss around a month.
Yet Jack doesn't believe their unavailability will make much difference to the way Hawthorn performs on Friday.
"They've got incredible belief in their structures and their processes," he said.
"When they get an injury, another kid comes in and fills it, which is a sign of a really strong team.
"There's talk that Mitchell and Lake are out, but two more will come in and fill the role for them.
"We look forward to it."
Lance Franklin is far from a certain starter to face his old team, with the key forward still trying to overcome knee tendonitis.
But whether or not Franklin plays, he will still have a big say in the Swans' planning for the match, according to Jack.
"I'm sure he won't have to tell us, we'll be asking him," Jack said.
"We'll be asking him the ins and outs of what they do and try to exploit them."
Jack has been spending more time in the forward line this season, kicking seven goals from his six games to date, including two against the Lions.
While his best value is still in and around the midfield, he enjoys the variety of playing as a small forward.
"It's good, it's been a different dimension," he said.
"It's a bit of the evolvement of the team – Ben McGlynn coming into the midfield, myself going forward, getting that mix of pace in and around the ball.
"On the weekend we had some real pace in the forward line with Harry Cunningham, myself and Brandon (Jack) coming on.
"It's just a part of how footy is now, you need some speed in your front half."
But there could've been a brotherly spat at the Gabba.
In the third quarter, Brandon ghosted in front of his older brother and then spilled a handball from Cunningham that was intended for the Swans' co-captain.
But luckily for the younger Jack, he earned a free kick for a tackle in the back and kicked the goal.
"He did take one off me," Kieren said. "I told him about that.
"We were lucky we were a few goals up. If it had been closer, I probably would've ripped his head off."
Twitter: @AFL_JD
