It’s SUPER easy. It’s been 3 years or so, but I’m pretty sure my sister (yes, the one who set my cake on fire) and I whipped the ones in the top picture out by ourselves in under an hour.
I loved them so much that I put more up in my playroom a month or two later. Great way to use the wasted space behind the door, right?
We have a giant roll of paper on the opposite wall in my play room. I’m thinking about putting a long one under it to hold pencils and crayons. You could use one to hold chalk and eraser on a chalkboard painted wall, too.