This gazebo is gorgeous and solid... and huge! Both my husband and I were surprised at how tall it ended up being, even though of course we’d looked at all the measurements. We had just taken down a smaller metal and canvas one that was disintegrating, so in comparison, this one is a beast! 
My husband and brother (with an occasional pop-in from me) spent about 5 hours on a Saturday getting the main structure assembled. Then my husband worked solo the next day for about 3-4 hours attaching all the roof panels. The main structure definitely needs two people to assemble with an occasional extra set of hands or arms to lift. But the roof panels were fine for one person with a ladder.