After purchasing this pergola and having it sit in my garage for some time I erected it, mostly by myself. I installed it on a concrete pad using redeye bolts and a 4x4 mount bracket. I used pressure treated posts scewed to the brackets using great care to have them 94" OC. The only assistance I needed was getting the joists through the posts and getting them equal. My only issue with the whole install were the end caps on the cross rails. The rails themselves were slightly rounded top and bottom so the caps were not snug at all and quite loose. So I needed to compress them ro geta good fit. I used clamps shown in the attached picture to flatten the rails then glued the inside of the rail and the caps and inserted them with the clamp in place. I let each cap set for about 20 minutes then removed the clamp. Worked great but a little time consuming since I only had two clamps. I'd suggest making caps that go over the rails rather than inside them and have them look like the post caps!