Install it where it feels comfortable to you at your normal anchor point then serve it in place. I actually use a rubber eliminator button for a kisser. It's smaller and won't shoot off the string for a VERY long time. I don't put the kisser in the corner of my mouth, I put it to the front of my lips so it moves straight away instead of scraping along the side of my lips. My nose is centered on the string and my index finger knuckle is in the pocket behind my earlobe. Solid three point reference and would be a fourth point if I used a peep but I only use a kisser.