The Easthampstead actress was practising her ballroom steps in one of the Birch Hill art centre's rehearsal rooms last week with dance partner Vincent Simone - ready for the first stage of the hit BBC competition next month.
Speaking exclusively to The News in between filming for the show, Miss Harmer said: "It's going really well, it's just the first week of training.
"Everything's difficult at the moment, I've never done ballroom so it's a massive learning curve, but I've got a good teacher.
"I'm really nervous about it and I'm only going to get more nervous, especially when I have to perform."
The 23-year-old - best known for playing the title role in CBBC show The Story of Tracy Beaker - has been enjoying being able to walk to her regular South Hill Park rehearsals and spending some time at her Easthampstead home - which she does not often get to do when she is working.
To read more about Dani's favourite dance moves and her "man flu" pick up a copy of the Bracknell News, out now.