"I practiced this for so many years and now we are almost there," he said. "So this is my biggest dream, and we are one step closer."
One step closer to a dream that would be nightmare for most people -- stepping out of a capsule 120,000 feet (23 miles) above Roswell, N.M., to plummet back to Earth at 690 mph. If all goes as hoped, he will be in freefall for almost five minutes, becoming the first person to break the sound barrier outside an aircraft. He will break records that have stood for 52 years. Red Bull is sponsoring this mission, called Stratos, and its team of 200 has worked for five years to make this mission a success.
He already jumped from 90,000 feet in July. That was practice.
The jump, initially scheduled for Monday, has been pushed to Tuesday because of weather conditions, according to Red Bull. Though a cold front is expected to pass by Monday, wind speeds are expected to remain too high to launch Baumgartner's balloon.
"The good news is that we usually have a day or two after this type of cold front moves through where the weather can be favorable for a balloon launch," said Red Bull Stratos meteorologist Don Day.
Every member of the team acknowledges the risks: extreme cold, the vacuum of space, temperature fluctuations, an uncontrolled flat spin that could hit 220 rpm, drogue chute failure, spacesuit puncture, life support systems failure.
Baumgartner will ascend in a pressurized capsule at dawn, in a balloon that will be 700 feet tall when filled with helium. The preparations start at midnight, with an hour or so to oxygenate Baumgartner, to purge his body of nitrogen.
The ascent to 120,000 feet will take a couple of hours. Once Baumgartner reaches altitude, he will depressurize the capsule, step out onto a ledge, and dive back down to Earth -- a plunge that could take seven minutes. He will have parachutes to slow him down when he hits 5,000 feet or terminal velocity. Terminal velocity occurs when a falling body experiences zero acceleration – as he gets closer to Earth the atmosphere gets denser so he will slow down and there will be less friction on his spacesuit. Or so they hope
Dr. Jonathan Clark heads the medical team and ticks off the risks on his fingers: "If you are going to be above 50 thousand feet you wear a pressure suit, above 63 thousand feet the water in your body would start to boil and your body is 70 percent water."
If Baumgartner succeeds he will break the record set on Aug. 16, 1960, when Air Force Col. Joe Kittinger jumped from a balloon at an altitude of 102,900 feet. He fell for almost five minutes before opening a parachute to slow his decent at 18,000 feet. He made history for the highest balloon ascent, the highest parachute jump, and the fastest speed by a human being through the atmosphere.
And Kittinger is Baumgartner's coach for this jump -- happy, he says, to see someone finally break his record.
"There is a reason my record has stood for 52 years," Kittinger said. "This is a calculated risk, you understand the risks that you know about but there is always unknowns. The biggest unknown we face is that nobody has transited the sound barrier without the aid of an aircraft."
Luke Aiken preps Baumgartner's parachutes before the jump and says it is like suiting up before the big game on Sunday.
"It's like you are going through the playoffs in a series, you know, and you make it through each round, and instead of the pressure getting less it gets more and more every step of the way," he said. "We are approaching the Super Bowl."
Baumgartner skydived from 96,000 feet in July, and told ABC News it was a mystical experience.
"It is overwhelming," he said. "You are standing there in a pressure suit, the only thing you hear is yourself breathing, Joe's voice [by radio], and you can see the curvature of the Earth. The sky is totally black, you have never seen such a black sky and you know there is only one person in the whole world who has been higher."
His mother, Baumgartner said, always lights a candle before one of his death-defying feats.
"Because if you run out of luck, if you run out of skills, there is nothing left and these are the very rare moments when you believe in God," he said. "And you really hope he is not letting you down."