Assembly is easy once you determine what bolt and stretcher goes where. Diagrams are small in size so lay out parts beforehand as to their precise location. When attaching seat frame, installed the middle small bolt and one large bolt at each end to facilitate alignment and easy install of remaining bolts.I also used a portable drill with Philips head bit  for final bolt tightening. However, sit on chair to ensure levelness before final tightening. Screws go in wood easily. I also tacked the seat to seat frame with four drops of super glue to insure precise desired positioning of seat  before turning the seat upside down for installing the four securing screws.