Sorry but that method is crude at best with a high end cartridge.I don't find doing it that way is close to desirable.
Question: do you want to measure phase (that many feel is more accurate and sounds the best) like with the Feickert or xtalk like the Foz? Or one can set for xtalk and then fine adjust azimuth by ear.
Some options:
1. Old Audio-Technica cartridge analyzer like I use. Xtalk
2. Foz Xtalk
3. Feickert Xtalk and phase among other things
4. Soon to be released Cartalign from Soundsmith ??? Will also have capability for zenith, VTF, anti skate, etc.
I like the Fozgometer and the Feickert Adjust Plus myself which I use......however if one doesn't have the tools or doesn't want to spend the money there are other ways of getting you there as mentioned above. The index card, mirror or the shiny side of a cd and using your ears can be most effective also. Before we had some of the nifty tools we all did it by sight and ear and we survived.
I'm giving this one a resteace:
If you're buying a real high end cartridge, why in the world wouldn't you get it set up properly and professionally? That's why you buy from a dealer. In NY I know of someone who does an excellent job and comes to your home.