Really great bed for the price.  Easy to build, just read the instructions carefully and make sure you sort out the screw lengths first as some look the same.  The only bit that's not pre drilled is putting in the slats.  Recommend you put the slats down, the position the base vertical, screw this into the slats top and bottom to make sure you have the right stretch then do the legs on the centre piece.  Then screw in all the small screws for the slats using an electric screwdriver as these are not pre screwed.  If you follow this, it's pretty simple and you won't have to take out screws when they aren't in the right place.