She said: "I'm putting myself into a different genre -- I'm therefore saying to the public, 'Can you accept me in a completely different format?' and that is risky.
"And obviously because it's Saturday night, I've got to glam up a bit. You know, there will be a few people who go, 'Oh, I don't like what she's wearing'."
Balding was interviewed while filming the series, wearing six-inch heels.
"I'm not running in them, am I? Mainly, I'm just walking three steps and stopping," she said.
When the interviewer said they look a bit "dominatrix", she responded: "Dominatrix! Don't you dare write that!"
Balding will also be hosting Good Morning Sunday on Radio 2, replacing Aled Jones on the weekly faith programme.
Asked whether she had a faith, she said it was "not significant" adding: "I'm very interested in other people's faith and I think that's what matters."
Balding said that her new "national treasure" label would not last, and she added: "I think 'ambitious' is one of those adjectives used for women in a derogatory way -- and, yet, I think ambition is crucial in life -- you have to know what you might be capable of and push yourself slightly beyond it."
She told Radio Times: "You come across words all the time that are everyday sexism. I was described as competently bossy and bossily competent by a male journalist and I thought, 'Gosh, bossy is never used of a man... A man would be called assertive or confident or quick or bright... five years ago that would have really upset me -- now I just think, 'Hmm --probably his failing, not mine. Move on'."
Asked whether she would ever consider hosting a chat show, Balding, whose civil partner is Radio 4 newsreader Alice Arnold, said: "I don't know whether a chat show isn't pushing it too far."