Having held off Collingwood's charge to secure a famous elimination final win on Saturday, Trengove said the Power's ability to dominate last quarters would hold them in good stead against the Cats, who were stung by a shock loss to Fremantle at Simonds Stadium.
Port Adelaide has run over the top of their opponents several times this season, including wins over West Coast, the Sydney Swans, Gold Coast and Adelaide (twice).
They also booted eight of the last 10 goals in their 25-point loss to Geelong at Simonds Stadium in round 20.
Trengove said the Power's resilience stemmed from the work of fitness co-ordinator Darren Burgess and the rest of his staff that was put in over the pre-season.
"We're pretty confident going into last quarters that if we're around the mark then we can go on and run out the game," Trengove said.
The Magpies seized the momentum with the first two goals of the final term to hit the lead, but the Power held their nerve, booting the last four goals of the game to record a memorable 24-point win.
"I thought we were able to hold ourselves quite well against their onslaught and sit and wait and then counteract on that," Trengove said on Sunday before boarding a flight back to Adelaide.
"I think it was a bit about waiting for their big surge and then for us to attack again, and we were able to get on the scoreboard."
Trengove admitted he and his teammates were still stunned by their improvement in 2013.
"If you asked at the start of the year whether we'd be playing in a final, we would probably say 'you're kidding yourself,'" he said.
"There's a real excitement around our footy club at the moment. Obviously the boys were pretty pumped at what we were able to dish up last night."
Forward Jay Schulz, who provided one of the night's many highlights with one of the marks of the season, said the change in Port's culture had been partly driven by the younger players.
"The group that we've got have really come close together over the past 12-18 months and they don't want to let each other down," Schulz said.
"You just know that when you're going out, and during the game, that you look around and you can see what others are doing and they don't want to disappoint each other and it's a really special thing to have."
But coach Ken Hinkley's work on and off the field was the real catalyst for the club's turnaround, according to Trengove.
"You can't underestimate what Ken has done for our football club this year," he said.