1. Trim away any longer hairs before giving yourself a nice, clean shave across your cheeks, neck and chin with a full-size trimmer–to about 3-5mm.
2. Wait for your moustache to grow. Trim away any stray hairs along the top edge of your moustache, using a precision trimmer.
3. Train your whiskers by brushing them downwards over your upper lip.
4. Trim your moustache as needed: a full-size trimmer with a zoom wheel will help you set and lock your chosen length setting. Use a precision trimmer to shape the ends as needed, creating a rounded edge about 0.5cm beyond the edge of your mouth.
5. Keep the rest of your cheeks, chin and neck cleanly shaven with a rotary shaver, moving in a gentle, circular motion. After a few months you can look forward to using your moustache as a soup strainer.
You may want to shampoo your Dallas moustache regularly, as well as trim it; like the real animal, they have a tendency to get a bit smelly.