Good custom strings and some of the better commercial strings, reduce the need to shoots a couple hundred shots to "set" the string, but they still need a few shots to settle in. You can have them put the peep in right away. Just don't pay any attention to it for a few dozen shots. The peep can't be positioned until the string has "set". At that poiint, you'll need the press again, to move strands on the peep, or to bring it in-line by twisting the string. This can usually all be done within 15 minutes or so.