Stewart, 20, plays the role of Bella Swan in the hit movie series and the cast are about to start filming the final movie, which is being released in two parts.
Speaking to MTV, she said: 'It's odd because [going back to set] feels the same, yet it's different because we all know that it is over.'
She added: 'To be honest, [the script is] never very striking, only because I know it.
'You read it until you get to the last page just hoping that it doesn't let you down, going: 'Okay yeah, yeah, yeah, that's what I got too, mm hmm, that's what I got.' It's really good. It's like, I don't know, it's very solid.'