Prince William has had his first day working as a rescue pilot with the East Anglian Air Ambulance.
The Duke of Cambridge confessed to "feeling the nerves" before he started his 7am shift but was "fantastically excited" and hopes the role would help him become "a good guy... a decent individual".
William will cover Norfolk, Suffolk, Cambridgeshire and Bedfordshire in his new role, which will see him transporting patients to hospital from emergencies.
He will be working from 7am to 4.30pm on an alternate rota system so it will not interfere with his royal duties.
"There's nothing to say I couldn't do it for the rest of my life. I might be able to, and still balance the two," he told the Daily Telegraph.
"But obviously at some point there is probably going to be a lot more pressure and responsibility from the other side of my life.
On the new addition to his family, he described Princess Charlotte as "a little joy of heaven".
William added: "But at the same time it is more responsibility, looking after two little ones, especially when George is around. He's a little monkey."
The Duke of Cambridge used to work as a RAF search and rescue helicopter pilot in Wales.