"I have always been interested in art and watched a tattoo being done.
"I was mesmerised, and never got tired of watching. It is a fascinating art form," she said.
Tattooing, they say, is more socially acceptable these days, as more people are tattooing their bodies for many reasons.
One of those reasons is as a memorial, which Ms Harkness says helps people with the healing and the grieving process of losing someone.
Tattoos are unique art statements of permanence, and tell different stories for those who wear them; and for others, "just because I want it".
One of Mr Smith's styles is Pasifika, from his Pasifika roots where all his cousins were tattooing in their traditional Samoan tatau. He also works in different styles and likes straight lines.
Those clean, bold lines that are the brand of a tattooist's expertise, of command and control of his handpiece, as he etches the design into the skin.
All four will each work with a client's own design.
They each have their own custom-built handpieces to suit their style. Ms Harkness' is light and small which suits her petite frame.
Mr Tepu, a ta moko artist, first picked up a tattooing gun three and a half years ago, and is another who was into art during his school years.
His first tattoo kit was a gift, and his interest in the art form progressed from there. He also practises a variety of styles.
Mr Sinclair is a freestyle tattooist and likes custom designs for his clients.
The big question for the uninitiated is, does tattooing hurt?
Mr Sinclair says: "No, pain is in the brain, it's a mental thing".
Mr Smith and Ms Harkness say yes, tattooing does come with a touch of pain.
Mr Tepu smiles politely: "As soon as the machine stops, the pain stops and you are left with a piece of art work."
They do, however, agree that it's different for everyone.