Bed was easy to put together, watch the video listed on item. Only difficulty was headboard/foodboard. I’m 58 female and did it by myself. I rested the headboard on something similar height. Footboard I leaned on top of my feet while screwing in by hand to line up. My mattress size is  Full 10” Cool Gel which I also bought from wayfair 4 star.  Attached is an Allen wrench that strips and rounds out, if you have your own it will do the job better. There are 2 sets of holes for 8 to 10” and 12 to 14”.  Karr Sleigh bed frame looks great, height is perfect, wanted it low, makes the small room I have look bigger. Thank you Wayfair, another great purchase.