Chain's on the right because the bike is mounted on the left. This comes from the traditional side of mounting a horse iir.

I actually charge a bit more to work on bikes without clipless pedals. The cage pedals really get in the way, especially when moving bikes around.

I put a lot of headsets together with a no-tab washer, but I put the wrench to each pair of wrench flats so as to get the nut really well-settled onto the threaded top cone/race. The nut ovalizes very slightly depending on the wrench position, and moving the wrench to different positions more-fully tightens it up without excessive torque or wrench gnarl on the flats.