The 21-year-old, who has played Hermione Granger for 11 years, likened her time on the wizarding franchise to the "most difficult film school" in existence.
"Watching the new film I feel I've really learned something in these 10 years," she told The Mirror. "For the first time I really felt like an actress and I have an idea of what I can be as an actress. And that is very exciting.
"I've worked with animals, special effects, I've done some serious stunts and I've worked with some of the best actors and actresses in the world. I couldn't have had better training.
"I feel I've graduated from the most difficult, hardcore film school of all time and I can't believe how lucky I've been. Now I'm ambitious to use what I've learned to do good work."
Asked to identify her favourite Harry Potter entry, Watson replied: "The first Harry Potter film will always be very close to my heart. But Deathly Hallows Part 1 and Part 2 are the ones I look back on as my favourites - we got stretched so much and really challenged."
However, Watson added that she was ready to move on from blockbuster movies and spoke fondly of her "amazing" coming-of-age film The Perks of Being A Wallflower, due for release next year.
"It had a minuscule budget, not a single special effect; it was mainly dialogue. I did lots of ad-libbing and I got to be funny," she explained.
"I had the most amazing time filming it - maybe the best six weeks of my life. And for the first time ever I felt sure that acting is what I want to pursue.
"I've got the blockbuster box well and truly ticked. I want to make smaller films that are really high quality and mean something to me personally.
Watson today admitted to feeling free now that the Harry Potter franchise has concluded.
Watch the full trailer for Harry Potter and the Deathly Hallows: Part 2 below:
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Watch Digital Spy ask the Harry Potter stars what is the secret to the boy wizard's success below: