As others have mentioned, it is very hard to put together, especially for one person, but if you can get through it, you’ll end up with the most sturdy and good looking day bed ever.  A couple quick tips:

1). Put Velcro on the slats instead of screwing them down; much easier to for removal and you won’t notice a difference

2). Make sure the lower back bed rail is in place before screwing both sides of the bed to the long back section.