Awesome shed! Recommendations take your time follow each step in order. However, I would complete step 36 ahead of step 31 so you can screw metal roof bracket into top of front  rear headers. Do Not screw down roof (Steps 34-35) until you get all screw boss (underside roof) inline on both sides with the metal supports. This makes it a lot easier and keeps everything looking good and square. It took me approx 8 hrs to complete. I had help just for the roof section. Once complete,  I was able to position on the slab no problem. Im very happy with my shed!