(3) heavy boxes.  One I had to cut apart to get the bottom out. I am a 69 yr. old mobility challenged women (nicer than disabled), and it was tough assembling it, but I got it done.  Wiring is screwy, so if something doesn't work, switch the like cords in the back.  Unfortunately, the short cord in the back goes to the heat & massage hand control, so it doesn't even come to the top of the armrest. I just put it together today, and all is working. How long that lasts remains to be seen, but I spent the extra for the 5 year protection, so hopefully I can get it fixed without too much of a delay if it goes down.  But for right now, all is working.