The actor is nervous about the sequence in the children's film Chillar Party, according to Mumbai Mirror.
A source told the paper: "Ranbir is taking all this pain to make sure that his first item number doesn't meet any glitches and wins him the audience's applause."
They added that Kapoor is happy with the choreography by Bosco-Caesar, but wants to make sure that the sequence is perfect.
The moves are said to be inspired by his actor father Rishi's character in the classic Bollywood film Amar Akbar Anthony.
Kapoor has previously been seen dancing on screen in a drinks commercial with Indian cricketing star Virender Sehwag.
