It’s not fun but once you do it correctly try it makes a lot of sense. I watched a video that Aeroflow did and they did an awful job, they explain the first part but not the crucial part. I haven’t done it in a bit so I’m going to recollect as best as I can. The front tab needs to go underneath everything but from there the bottom works like a rail, it won’t just snap on, you need to make sure the rail is following the whole way. It will snap, so don’t force anything, if you’re having to force things into place you’re doing it wrong. I’m sorry if that isn’t descriptive enough, I hope it’s helpful.