Nikita Ridgeway, 29, Australia

Nikita is the founder and chief executive of Dreamtime Ink Australia, the only company specialising in Aboriginal tattoos.

She is also the owner of Boss Lady Creative Design Agency, which aims to provide Aboriginal designs at affordable prices.

Her advice: "The road to happiness and success lays in two simple principles - find what it is that interests you and that you can do well, and when you find it put your whole soul into it, every bit of energy and ambition and natural ability you have."

You can find our 30 entrepreneurs talking about their experiences in under 30 seconds each on our 30under30 special report .