"American Horror Story" season 4 cast Sarah Paulson said that she's pushing herself for the character she plays in the hit Ryan Murphy series, as she claims that she's her own biggest critic.

When asked if what role she finds most difficult to play, she told The Hollywood Reporter: "I would say in season two, it was twofold: One, when I had to simulate performing an abortion on myself, and two, playing a 75-year-old woman. That was very hard," she said.

She explained that she didn't want to play a caricature of the character that she played and wanted to "hold on to who the character of Lana Winters."

"Also, I had the crazy makeup on that was terrifying, and I sent the photograph to my mother, and I was like: 'I guess you'll never see this. This is me at 75!'"

"American Horror Story" season 4 cast Sarah Paulson also revealed that she can be her own biggest critic and she gets frustrated when she hasn't asked for another take. "I get really panicked sometimes when I can feel the clock going. We're all under the gun; our show's very expensive. There's never enough time," she said.

"I think the comfort of being on a show for a while [means] I can look over at James, our camera operator, and say, 'Can I please have another one?' And he'll find a way to help me out, which I never can do on a movie - ever," "American Horror Story" season 4 cast Sarah Paulson added.

Meanwhiel, "American Horror Story" season 4 creator Ryan Murphy said that Sarah Paulson's role could be the most physically and emotionally taxing among the characters in the show.

He told Entertainment Weekly Radio that it's "the most challenging character I've ever created. I'm nervous for Sarah."

Meanwhile, he revealed that he will direct the season premiere. The last time he helmed an episode was back in season 1 for the pilot.

"I'm so excited for 'Freak Show,'" Ryan Murphy said, who promised viewers that "American Horror Story: Freak Show" will be a "super scary thrill ride."