Reading "K2 - Triumph and Tragedy" and Youtube K2 videos

Re-reading Jim Curran's book about K2 for about the fourth time.  I have also discovered that people have started making films of mountaineering trips using more basic camcorders and gopro cameras, and watching some of these on Youtube, I was amazed by how steep K2 is when you see it up close - maybe 50 degrees for most of the ascent?

I am also left wondering how you navigate on such a huge expanse.