The Hollyoaks actress will be thrown into the air by three male skaters, who will spin around before trying to catch her, The Sun reports.
"There is definitely some scary stuff with my routine. We practised with a carpet and it absolutely collapsed and fell on the floor," she explained.
"There are three of them in a line, Sylvain [Longchambon], Mark [Hanretty] and [partner] Matt [Evers], and I'm lying across them then they throw me in the air and spin around and catch me.
"I was scared so I made Jayne do it first as well. She was really up for it. And she wanted to do the other parts too but the physio wouldn't let her.
"I've never said no, I've always been quite fearless throughout the show. But I thought they were lying when they were saying what they wanted to do with me. I thought, 'Is this a joke?'"
Of competing in the series, Porter added: "I still can't believe I'm the last girl standing. I think in days or weeks to come I'll be like, 'Oh my God, I did this'.
"At the minute I am just taking it in. I can feel myself crying my eyes out no matter what happens."
Dancing on Ice's grand finale airs tonight at 6.50pm on ITV1.
Watch Porter with rivals Matthew Wolfenden and Chico talking to Digital Spy about the final below: