Robert Pattinson found it "hard" work doing the 'Twilight' sequels

In an interview with Deadline, he spilled: "When I came to doing the first 'Twilight', I actually felt I had a lot more control over my performance, because I didn't really realise what it was.

"And that was because of Catherine Hardwicke, as well - she made it so malleable, which it can be when nobody knows what something is.

"I really liked doing all of those films, but on the first one I definitely felt like, because we hadn't set the footprint for the thing ... I feel like, as soon as you set a footprint your instinct immediately is to want to break out of it, and you can't.

"There are too many reasons you can't just throw it all up in the air. The only hard thing about doing that series was doing the sequels."

The big screen hunk - whose next role is in the Safdie brothers' forthcoming flick 'Good Time' - got his first big gig in 'Harry Potter and the Goblet of Fire', and he learnt a lot about making his role his own from Ralph Fiennes, who portrayed Lord Voldemort.

He said: "I was cast so young, so I had just sort of started when I did it.

"Well, I find it interesting how even there you can have this level of confidence to just do your thing regardless. I remember Ralph Fiennes being born as Voldemort. I'd shot a lot before, and it was the first moment where everyone was kind of tense, because nobody really knew what he was going to do with it. He came out, and it was interesting seeing someone with that level of experience make it his own. Because you can have so much infrastructure around you, but to have someone come out and everyone be like, 'What's he going to do?' That was really exciting."