axle bearings, need help

Hi guys, so i know there is always been a heated debate over the green bearings and stock adjustable ones. Im doing a rear disk brake conversion on my 8 3/4 and i needed to get the green bearings for my axles. I called a machine shop to press them in and they are asking me for instructions for doing it? Is there some kind of instructions that they need to follow to press them in ? cause i have no idea???? please help

Thanks