The Harry Potter and the Deathly Hallows: Part 2 star confessed that she found it bizarre to have to play herself as an adult for the last scene in the final instalment of the magical series, the Los Angeles Times reports.
"It was really interesting and challenging," Watson said. "The thing that was hardest was trying to imagine that I had children that I was sending off to school. That was really strange. And it was weird that I was seeing these guys that I'd grown up with suddenly looking old. But it was fun."
Watson went on to admit that the use of make-up and costumes helped her get into character.
"It felt nice to do that scene, but it really felt as if we had completed that journey as fully as we possibly could," Watson said. "We had make-up on. I had, like, a little fat suit that changed my figure a little - it changed the shape of my body a little. And I had a wig and teeth in.
"It wasn't as scary as I thought it was going to be. I thought it was really going to freak me out," Watson concluded.
The 21-year-old recently revealed that she is looking forward to the end of the Harry Potter series, stating that she hopes to discover more about her true self after spending 11 years as Hermione.
Watson previously claimed that she is embarrassed by the early Harry Potter films since the movies show her during her "awkward" stages of growing up.
Harry Potter and the Deathly Hallows: Part 2 opens in cinemas on Friday, July 15.
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Watch Hollywood stars Tom Hanks, Russell Brand, Vanessa Hudgens and more discuss Harry Potter with Digital Spy below: