I injured my knee on this hike because I didn't have walking sticks/poles. Do yourself a favour and bring them as it's a steep descent for 7 miles. The view changes a lot which is really great, unlike Bright Angel. Take your time when you do it so that you can really appreciate the views rather than just looking at the path the whole time. We took the hiker's express bus at 8:00 and were on the trail by 8:30, we were at Phantom Ranch by 13:30. We carried two litres of water, but they recommend three. In the summer, you have to have three. The sun is on you for the majority of this hike, even in the winter, your face can burn.