Do an item inventory as soon as you open the box! I was short one E connector and had an extra B connector. I didn’t bother with customer service and just made it work. But knowing that at the beginning helped. The diagrams were easy to read until I got to the cover! But I finally found the correct way it went on. Look for the window! It goes over the curved side! All in all it’s a good sized greenhouse. Roomier inside than I thought it would be. Easy to put together.