I'm not going to lie. I had a friend build this for me and he happens to be a builder. My job was to lay out the materials and assist with tools, holding things, and doublechecking the directions. We got this done in one day although I'm still waiting for my husband to finish attaching the roof braces because I'm too short (even on a ladder). 

The day after we built the greenhouse, we got to test its durability when a storm with high winds blew through. The greenhouse stay anchored in place and there were no issues with shifting.
The windows still need some wiggling to get completely in place, but they do shut well enough. 

This greenhouse is the size and price point I was seeking. I foresee using it for many years to come.