Once you get a press, the rest is easy. With the bow strung but un****ed, mark the location of the cam lobes to your limbs so you can duplicate the string height. Easiest way is to make a mark on the cam amd the adjacent limb with a soft pencil. Press the bow and remove the string. Install replacement string, let press down. Check to see if cams are similarly situated as when old string was on. If not, press again and shorten string by twisting or lengthen by untwisting.
WBT, let bow set for a while after installing a new string, even shoot it, to stretch a new string before adjusting.