I was skeptical about this and was fully prepared for no one to show up, but sure enough on a Saturday, 8:30 am, just as I requested, a very nice , courteous handyman showed up and went to work on the bookshelf.  He had it put together in less than an hour.  Fast, professional, and did a great job. I know he only gets a small fraction of the assembly fee I paid to wayfair, so I gave him extra for a job well done.