I experienced this procedure firsthand and can say that the piercers at the studio I chose are simply magical. I got my daith pierced there, having researched all the details on their website beforehand: https://thefalltattooing.com/pages/daith-piercing. Their offices are as clean as a good clinic, and the piercer completed the cartilage piercing in seconds. The ring quality is superb, and most importantly, my headaches have really decreased, so I'm incredibly happy with the results.