Really you want to avoid ’wrong’ i.e. you don’t need perfect, but you can refine by listening IF you have the ears for it.
I bought one of these transparent adjustable protractors,
you can see the cantilever i.e. shure V15 = 15% VTA. Find your cartridge’s recommended VTA.
Then, SRA, look it up,
I settled on 91% (while ’down’ on lp surface (no need to play, just with the tracking force applied).
you need to pretend you can see the stylus tip while viewing thru it, or holding it behind. this helps find 90 or a speck more or less than 90, also for front view setting azimuth
You can see enough to know no damage will occur, essentially correct, play on.