Call or email piercing shops in your area to locate a piercer certified by the Association of Professional Piercers or use the "locate a member" function at safepiercing.org.
Visit the piercer's shop and look through his portfolio for pictures of microdermal piercings he has done in the past. Look for the piercing you want in the piercer's portfolio to confirm that he has experience performing it.
Eat within two hours of your piercing appointment. Eating keeps your blood sugar stable and minimizes your risk of becoming lightheaded during or after the procedure.
Breathe deeply while the piercer performs the piercing. Focus on even inhalation and exhalation.
Follow your piercer's aftercare instructions carefully for the full length of time instructed to ensure that your piercing heals correctly.