I don't write reviews often but I am so happy with these chairs I had to do one!  The assembly was straightforward though it took me a few minutes to interpret that the first diagram is of the chair laying on its back with the seat jutting up into the air.  My chairs have no wobbles and feel exceptionally sturdy.  Take your time and you should be fine.  I adjusted bolts three times.  First, finger tight.  Then I did the drop alignment they suggest and it was interesting how everything aligned and how much further bolts needed screwing down.  Tightened again with the long end of the Allen wrench, checked the wobble, sat in it, then cranked them all down one last time with the torque of the short end of the wrench.  Wish they were made in America but happy they come from anywhere other than China!