Once assembled the Greenhouse looks great ... not too difficult to assemble as the parts fit well as long as you are working with a level starting point.  The directions are extensive and requires a bit of patience to review the many different parts and how they are assembled.  It will take approximately 5-6 hours for one person and may require a second person to assemble the roofing.  I agree with some of the other reviews that it is similar to IKEA construction as there are many parts and components.