Danny Boyle says it has been "a long road" to the Olympic opening ceremony and it feels "extraordinary" to be part of the Games.
The Oscar-winner dedicated his £27 million extravaganza to the 15,000 volunteers who will help bring the show to life.
Seven years of planning will come to a head when Boyle's Isles of Wonder spectacular begins and the Games get under way.
It's expected 62,000 people will be in the audience at the Olympic Stadium and a potential global television audience of billions will see the Olympic Torch complete its 8,000-mile journey around the UK as the mystery surrounding who will light the cauldron is revealed.
Boyle said: "The thing about directors is that they just sit at the back in the end. This is a live performance and it's the actors, and in our case they're volunteers, who have to get up there and do it.
"So any kind of nervousness I feel is for them really, because my nerves are not important. And the excitement I feel about it is obviously the excitement I think they feel.
"It's been a long road and we're almost there.
"I'm looking forward to it very much. Whatever comes our way comes our way, because it's live and it's for one time only, I'll never do one again.
"It is extraordinary to be involved in".