Brit Hazel Findlay has put together a nice post on her blog detailing her efforts, along with Neil Dyer and James McHaffie, to do the 2nd free ascent of the PreMuir (5.13+, 33 pitches) on El Capitan:

I think that when I look back at our PreMuir mission, what I will remember most is being on that ledge at 9.30 at night almost too mentally and physically tired of trying hard to enjoy the moment. We could taste the relief that was to come, but still there was some small doubt that we wouldn’t be able to pull it out of the bag. But skill, or good luck, or effort or something else was on our side and the next day we found ourselves at the top, too tired to sing and dance, but happy nonetheless.

It’s well worth reading the full post, which is loaded with great pictures from Tom Evans, to get a good sense of the effort required to free climb these hard lines on El Cap.