This book case is way too complex to be assembled without help.   I would suggested that the hexagon shapes be preassembled. 
I had a great handy man but he needed special tools to assemble these shapes without damage.  The predrilled holes didn't align properly.   He had  to take these parts home and bring them back to finish the assembly.  It took him 4 hours to assemble the whole thing.  
Otherwise it's a beautiful bookcase.   
Once assembled it's beautiful.   Looks very nice in our office.  If you do buy it order the handyman service.