A royal wedding might appear to be a fairy tale but, behind the scenes, it's more like a military campaign with hundreds of details to be executed with clock-like precision.
There's the cleaning of the royal carriages, the polishing of horses hooves and the tuning of trumpets, for instance.
And with less than two weeks to go until Kate Middleton and Prince William tie the knot, there's little left to be organized.
"Nothing is left for the last minute," said Sir Malcolm Ross, who planned celebrations for the royal family (including Charles and Camilla's wedding) for almost two decades. "Absolutely nothing ... in the palace, in the Middleton household, everything will have been arranged, ordered and it will be available for the day."
Don't expect any surprises, Ross added.
"Nothing will go wrong," he said. "I mean there is no room for error."
In order for nothing to go wrong, everything -- quite literally -- has been thought of. Believe it or not, the cobblestones outside Westminster Abbey have been given special treatment.
"They have been vacuumed," Ross said. "We are aware that we're producing a show. And we must make it something that the world will enjoy and we will be proud of."
The view from behind the scenes is distinctly different from what the public sees, and something that is rarely talked about.
ABC's Barbara Walters recently spoke exclusively with India Hicks, who was 13 in 1981 when her godfather, Prince Charles, asked her to be his bridesmaid.
She vividly recalls what Diana was wearing on the morning of her wedding day.
"She turned up in a pair of jeans," Hicks said. "I have this lasting impression of Diana with a diamond tiara on top of her head, dressed in jeans below while they fitted the tiara to see what it would look like."
And it turns out Diana was watching the television as she got dressed.
"She was very intrigued by it," Hicks said. "For her, it was so new to see herself on television. Can you imagine? I mean her whole life going before her eyes and she kept pushing everybody out of the way; move, she'd say."
The little bridesmaid had one simlple thought when she saw Diana in that dress.
"I thought, a princess. She was the bride; all brides have that sense of being the center of attention," Hicks said. "But she had that star quality."
Hicks kept a scrapbook of Charles and Diana's wedding day, along with a program just given to wedding participants.
She remembers waiting outside St. Paul's Cathedral with fellow bridesmaid Sarah Armstrong Jones, the queen's niece, when Princess Diana arrived.
As the trumpets sounded, Diana appeared.
"With the train and all crumpled; a big crumpled mess comes out of the carriage," Hicks said.
India and Sarah had the job of managing that famous train, that stretched a record-breaking 25 feet.
"The job wasn't going right," Hicks said.
But Diana was sympathetic, "and turned round and just said, 'Do your best.'"
And so India navigated her way up the aisle in front of a global audience of 750 million people. "I was thinking my shoes hurt, they're pinching," Hicks said, "and it was a long way down that red carpet to the altar. But there was an aura about that day."