Binding is hard! There's also more than one way to do it, so you might want to read up on different ways to do it if you attempt it again. I tried a few different ways before I settled on the one that worked best for me. I find it easiest to fold the strip in half along the length, sew it on to the back, and then fold it over to the front (sorry, this is probably not a helpful description unless you already know what I mean). This has the bonus of not needing to make double fold binding tape which is a minor pain. I've tried self-binding a few times, and it was a disaster - seemed like it would be easier, but it was harder (for me).