Keen not to be billed as the "poster girl" for older women, the Miranda star, 53, approached the BBC hit show with caution.
But she has now binned her negative expectations and is storming through stunning dances with pro Vito Coppola, 32.
The actress, who lives in London with her daughter, said: "I was setting limits without realising.
Mindset
"I just thought, 'I'm quite a good dancer. I did a lot of dancing 30 years ago. I know what I can do'...but in the same breath I was saying, 'This is what I can't do'.
"I think a lot of women do that to themselves.
"But I think you also have to change mindset, your because if you say this is my limitation, then other people agree and it becomes something very solid.
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