I am a big chicken when it comes to heights. As I get older, I am more afraid of it especially if I have to go out to the edge of a roof and look down.
Some time ago, we built a third floor addition in the Hollywood hills. This damn house had the best view of the city but with that, it hangs over the side of a hills. it was only a 4/12 roof, but my crazy framer would go up there with a piece of 2x12x16' and frame that thing. He was basically walking on a piece of lumber 1.5" in width with a nail bag, gun and a piece of huge lumber. That bustard said it was for balance.
I had to get up there to check his work. After spending sometime up there, you get used to the fear and I can go up to th edge and look down. it was about a 5 story drop. I stop doing those jobs.