I was able to assemble the futon by myself until the final step. It is cumbersome and heavy. I am very strong, but I think anyone would need a second person to do the final step. And that was sliding the (folding) bed base into the futon frame. 
A tip, make sure that you attach the rubber pieces to the ends of the bed base correctly. I had put them on backwards. When my neighbor came over to help me lift and place the bed base into the frame she noticed that I hade attached them backwards. 
I love the futon and am glad I got it.