Excellent.
I had just purchase (2) of your backdrops a few weeks ago and received them last Friday.
Saturday, my wife gave me a hand and it could not have gone any easier. Watching the video certainly helped before we started. We went with the "dry" approach. You are correct, you need to have it perfectly aligned the first time!
I had "mis-measured" my height requirement and had to "cut off" the sky portion on both of them. My fault and it did not detract from the backdrop one little bit. I already had my walls painted a "sky blue" color, the only thing I was missing are the clouds, no big deal.
They look great, I could not be happier. I will be ordering more for the remainder of the layout.
Thanks for a quality and durable product.
Donald