I love these shelves and have now moved them three times! Patching the walls for the many screw holes was a challenge, but these things are durable, neat and provide a somewhat simple way to display trains with minimal work. I agree that the pins are rough to install and even more difficult to remove when taking apart. Follow the really good advice above and I'm sure you will be pleased. Here are a couple of pictures of the shelves on my prior (PA) layout on a very long wall - four 6' lengths attached using the clips, and my current use of the shelves trimmed to fit on panels on the side of my current layout: