The Cameron Murray actor will play a central role in the rural soap's 40th anniversary week as his character's love triangle with Chas and Debbie unravels.
Power told Soaplife: "Every time I hear that four-letter word 'live' I get a sort of numb sensation in my left arm and I think I'm about to have a bit of a clutcher."
However, he added more positively: "I think it'll be a good challenge. There's a real buzz, a real adrenaline to the atmosphere and I'm hoping that's what carries me through."
Of Cameron's change of personality since arriving in March last year, Power added: "It helps that Cameron was so charming and now he's become so duplicitous.
"I think what Cameron is good at doing is being your worst nightmare, but with a twinkle in his eye."
Emmerdale Live airs next Wednesday (October 17) between 7pm and 8pm on ITV1.
> Read more news and gossip about Emmerdale's 40th birthday here
Watch a new teaser for Emmerdale's live episode below: