Actor Tom Hardy is set to play the role of Elton John in the upcoming biopic, Rocketman, about the life of the British musician, singer and songwriter.

But it’s not easy, Hardy admitted in a recent interview with The Sun, saying “I’m not a singer. I have no idea, really. I’m really trying because of Rocketman but it’s hard to open my mouth in that way.”

Hardy also admitted that he took on the role because it’s something he didn’t think he could do. “I’m drawn toward that which I think I will probably fail at doing.”

“It’s out of my comfort zone,” he added.

Rocketman, written by Lee Hall (Billy Elliot), started filming last year.  A release date has not yet been set.