I personally set up every guitar myself. Each fret is checked to see that it is level and properly crowned. The frets are then polished and buffed with 0000 steel wool. The bone nut slots are filed to the proper depth so that the strings are super close to the first fret. The bone saddle is removed and lightly sanded and steel wooled to be smooth and have a good break angle for the strings. The saddle is then slipped back into the saddle slot and the string height is measured and shaped to get the proper string height.  The string height from the bottom of the first string to the top of the 12th fret is usually set at 7/64”, more easily seen on the rule as three and one-half 32nd”. The height of the 6th string from the bottom of the string to the top of the 12th fret is usually set just shy of 4/32”.