The King is feeling relaxed and looking forward to his Coronation, one of the ceremony’s key clergymen said.
The Dean of Westminster revealed that rehearsals had gone well and predicted the event will be “jaw dropping”.
The Very Rev Dr David Hoyle said the King had been “relaxed and gracious” during the Westminster Abbey run-throughs.
“He took time to thank all the many people around him who are making this happen.
“So while he has a huge burden on him and there’s a lot for him to do, he doesn’t give the sense of being really anxious about this. Not at all.”
DON'T MISS:King Charles 'crushed' after '20 minutes' notice of Meghan Markle announcement
Kym Marsh splits from husband less than two years on from star-studded wedding
Karl Lagerfeld's beloved cat invited to walk Met Gala red carpet in honour of late owner
Charles, 74, who yesterday met indigenous leaders from around the world, has practised with the real crown jewels at the Abbey.
Replica crowns had been used for earlier dry runs at Buckingham Palace.
The Dean said the King’s grandchildren, including Princes George and Louis and Princess Charlotte had “watched with huge interest”.
The Dean, who will have to handle the crown before the Archbishop of Canterbury places it on the King’s head, said he had been practising holding it the right way round.
He added: “I am used to ceremonies on a national level but even I think this is pretty jaw-dropping.” Among leaders welcomed by the King at Buckingham Palace yesterday was Amazonian elder Uyunkar Domingo Peas.
Wearing traditional costume, he greeted Charles with a hug and presented him with a feathered crown in recognition of his efforts to save the rainforest.
Fellow leader Atossa Soltani gave him a necklace of seeds to symbolise an alliance between the monarch and indigenous people.
The King also welcomed the Ashanti King from Ghana, Otumfuo Osei Tutu II and Lady Julia Osei Tutu.
A multi-coloured parasol was held over the Ghanaian monarch’s head to denote the visiting king’s seniority.
Charles and Camilla met the ceremonial ruler in 2018 during a tour of Ghana. He has a long relationship with the British monarchy and had previously met the late Queen.
Another visitor was Canadian RoseAnne Archibald, National Chief of the Assembly of First Nations.
Some 100 heads of state will be among dignitaries from 203 countries attending the ceremony. Yesterday one of them, Ukraine ’s First Lady Olena Zalenska, was greeted by PM’s wife Akshata Murty at 10 Downing Street.
Nearby, Insp Alexandra McDonagh, who will lead the Coronation procession on police horse Wilbur, met her boss, Home Secretary Suella Braverman.
Meanwhile, the man behind flower displays for the event said they would “reflect the real characters of the King and Queen”.
The Abbey will be decked in seasonal blooms and foliage from all four UK nations.
Crab apple blossom, amelanchier, camellia, acer, hazel, rhododendron, and azalea will be arranged alongside beech cut from an ancient cluster of trees once visited by Queen Victoria. They are and now maintained by the Royal Horticultural Society at their Bridgewater Gardens in Salford, Greater Manchester.
Shane Connolly, 60, who was also in charge of the floral displays for the weddings of Charles and Camilla and William and Kate, said: “The flowers are one of the things that can reflect the real characters of the King and Queen.
“They are simple, British and seasonal, such as they might cut from their own gardens.
“That was my aim, to make it all incredibly personal to them. And also showing that you can use British-grown seasonal flowers on a scale of this coronation.
“I also felt that it should come from all four nations, that they should all be represented.
READ MORE: Royal Family will be 'eager to crack on with work after Coronation', expert predicts