I went to see this installation right before sunrise and it was amazing! Try to go by yourself or in a small group as it's great to experience in silence.
When I went, I was completely by myself. It was easy to get to by train from downtown Phoenix; it drops you off right at the corner. Don't be afraid to lie down on the ground right in the middle to get a good view. For pictures I liked being a bit off center as I wanted to get the moon in my photo as well.
I don't want to give much away because the feeling itself is kind of indescribable. You really need to experience it yourself. Make sure to take pictures, but also don't get too distracted that you don't get to enjoy the installation itself.