We just started filming, and after every scene was shot, we had a rehearsal for the next one.

I think coughing up slugs was quite hard. Ron has a scene where he has to cough up these giant slugs.

Well one of the times I did a stunt was in the devil's snare room and they lifted me up on a harness and a safety rope really, really high, and they just dropped me down into the devil's snare.

I shot on an off, basically, from about 4:15 until they started filming at 6. I didn't shoot non-stop during the show. I was talking to people some of the time.

It's always at the back of my mind that acting might come to an end for me when Harry Potter finishes. I don't know if I'm good enough to have a long career. I've got a bit of an inferiority complex about my acting. My self-esteem is quite low in that sense.

I'm shorter, I don't have as many freckles as Ron, and I can't do magic.