I have been assembling this by myself.  I am doing the walls today and will have a neighbor help. So far, not bad.  The only difficulty was sliding the metal door frames onto the door -- need lots of hammering with a mallet, but I got it done.  It's rugged -- I had to leave its pieces exposed to the elements and it held up very well.  I love the size and the niceties like windows and skylights.  Only bad thing was one of the metal pieces did not get primed properly and the paint started peeling off.  They responded to my concern immediately and are sending me a replacement part.  There are LOTS of parts; make sure you keep items in their labeled bags so you know what goes where.  The lifetime warranty is a big plus.  They  have videos and a help line but I have not needed these.  Instructions very clear.