Installing cartr.:slide it all the way to front?

Your arm or turntable manual should tell what the overhang should be. This will hold you over until you get an alignment device of some kind. Overhang should be measured form pivot to stylus tip.

while the arm is under the designers control, cartridge and turntable are usually made by someone else. Thus the overhang is affected by the size of turntatble plinth, where the hole is drilled and the size of the catridge. So let's say you buy a sota millenia with SME V and and sumiko celebration and it was used to voice that table. You may find that it would be right just by following the manufactures instructions. Use of arm and cartridge of your choice means adjusting accordingly.