As several have noted, if you're just looking for a starting point then any reasonable point will do. Armwand level is reasonable. Bottom of cartridge parallel to record surface is reasonable. Spending 4 hours with a microscope and spot light is... reasonable if you prefer that sort of thing to listening to music.
The fine tuning, if your ears tell you it would be beneficial, must be done on an individual LP basis by listening with educated ears. Precisely where you start from is of little consequence, so don't fret what doesn't much matter.
The fine tuning, if your ears tell you it would be beneficial, must be done on an individual LP basis by listening with educated ears. Precisely where you start from is of little consequence, so don't fret what doesn't much matter.