The Ballymena-born star plays dwarf Bofur in Peter Jackson’s trilogy of JRR Tolkien’s tale, the precursor to the Lord of the Rings story.
“It is a big film - it is the really the biggest film ever made - so the scale of it was extraordinary, and very exciting and at times a little bit daunting,” said Nesbitt.
“It was also at times a bit frustrating when you feel that you’re a very, very small cog in a very, very big machine.
“But ultimately working with Jackson was a treat and I’ll always be able to say I was a dwarf in The Hobbit and there’s only 13 of us will ever be able to say that.”
>Click play button to listen to our James Nesbitt interview<
He described his children as “heartbroken at first,” when he and wife Sonia explained they were moving temporarily to New Zealand.
But, he added: “It turned out great. The kids were introduced and integrated into different cultures and my kids will always have a touch of Máori in them.”
The Hobitt: an Unexpected Journey opens at cinemas in Northern Ireland in mid December. Parts 2 and 3 - The Desolation of Smaug and There and Back Again - follow in 2013 and 2014.
Nesbitt was speaking during a visit to Coleraine last week.
In the audio interview (above), he also speaks about his role as Chancellor of the University of Ulster and his work with the charity Wave, which supports people traumatised by the Northern Ireland Troubles.
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Your forceful personality makes people sit up and take notice of you. This is a great time to show off your expert knowledge. Demonstrating a command for facts and figures will result in a teaching or media position. Make sure you don't impose this air of authority at home. Your family won't appreciate being ordered around. You may be a superstar in intellectual circles, but you're just another relative on the domestic front. Don't bristle at your loved ones' irreverence. It's good for your ego.More