The couple, who exchanged vows in May at Windsor Castle, have spent their first few months as a married couple finding their feet in public life and developing celebrity friendships with A-listers like George and Amal Clooney.
Speaking about why Windsor is so important to the bride and groom, Sky's events commentator Alastair Bruce said: "It's perfectly created to be the most lovely backdrop for any occasion".
In an interview with British Vogue earlier this year, Eugenie said she is "anti-plastic" and aims for the wedding to be plastic-free.
Stars from the world of showbusiness and sport attended Harry's wedding and Buckingham Palace announced that one of Eugenie's bridesmaids will be Theodora Williams, the six-year-old daughter of pop star Robbie Williams and his wife Ayda Field. Five of them will be royal, but the other will be showbusiness royalty.
There has been some criticism about the cost of security around the event, which will be paid for by the taxpayer like all royal events.
Discretion is key for the royal power couple, who are committed to their royal roles but aren't subject to the same scrutiny and expectation as Kate Middleton and Prince William, who is second in line to the throne.
But there are some differences from Harry and Meghan's wedding. He said: "For local residents, they're probably fairly indifferent in truth".
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He moved around the Resolute Desk and hugged the president, who was still seated. "That's from the heart". President Donald Trump during a meeting in the Oval office of the White House on October 11, 2018 .
And preparations for Eugenie and fiance Jack Brooksbank's cake are now underway ahead of their nuptials on Friday 12 October.
She shared: "It's nerve-wracking and a bit scary and all the things that come with getting married, but at the end of the day you get to marry the person you love".
Members of the Royal Family are expected to begin arriving at Windsor Castle's Galilee Porch at about 10:25 BST, with the ceremony starting at 11:00. The singer Andrea Bocelli will perform two songs.
They will also hear a personal prayer written by the Archbishop of York, Dr John Sentamu.
Following the rehearsal David Conner, the Dean of Windsor, described Eugenie and Jack as the "perfect couple".
The group says Eugenie does not carry out royal duties and that weddings are personal, private occasions, not affairs of state. For the family, and especially the bride and groom, this big day will be just as special.