In reply to Darron:
Indeed. And yet you read some of those mission transcripts and it all sounds a lot less precise than you might have originally imagined (eg trying to fix the camera by hitting it with a hammer)
The courage must have been innate (and that is part of how they got through the selection process)
Tom Wolfe in The Right Stuff makes the good point that by the time John Glenn made his legendary flight, all the astronauts were pretty much the most prepared people ever sent on a “hazardous” mission such that, aside from the courage required to get over the fact that lots of things could kill you, the actual mission was so tightly scripted that it was almost a token gesture. You could compare it to how Amundsen had no issue with the South Pole as he was so expert with dogs and sleds and similar terrain, that it was almost literally a walk in the park for him....whereas Scott was way outside any comfort zone