Smith, 70, and her husband David Kaltschmidt, 55, who now plans on retiring from his job as an engineer, bought the winning ticket at their neighborhood Publix, they said during a press conference with Florida Lottery on Wednesday.
Although Smith said she's "a little overwhelmed, but excited," she also admits it's "scary and unknown."
She says they have "lost a lot of sleep," since they found out they won, while Kaltschmidt admits he's also lost ten pounds and that "there is a lot of pacing at night."
The couple, who have increased the security in their home, are worried about what's going to be happen "because we know that we are no longer in a quiet place which I'm going to miss," says Smith.
She's also concerned that it will "make me less friendly because I'll be worried."
In the past, the couple has thought about what they would do if they ever won the lottery, but when it actually happened, "it all went out of my head," she said. They decided to take the lump sum of $327 million over the annual installments.
While they don't know how they will spend their winnings just yet, Smith said she wants to help "special people in my life," and that she and her husband will "not be going out to party".
Kaltschmidt , who kept their winnings a secret from even their family until a week ago, plans to become involved with philanthropy, but he is also going to buy himself a new truck because the one he has is falling apart.
Despite being $327 million richer, Kaltschmidt said they "will still live the same life – basically."
Last month, the Robinson family of Munford, Tennessee, came forward as owners of one of three winning tickets from the headline-making Powerball drawing.
The family told ABC News that since coming forward as winners, they've been "overwhelmed" with total strangers "begging for money" and a prisoner has filed a handwritten lawsuit, suing them for a share of their winnings claiming he gave their daughter money to buy lottery tickets.
Although they've only been multimillionaires since January, they do have some advice for the Florida couple:
"Don't let people pressure you," they said. "Have someone else sort your mail, and if it feels wrong, don’t do it."
The third winner who bought a ticket in Chino Hills, California, has yet to come forward.