How do you pierce your ear cartilage and not get deformation?

It's called Professional Body Piercing, performed by and experienced professional body piercer working in a licensed and inspected facility. Not a piercing gun boutique or the moron down the street that says he can do it. Body Piercing is an art that requires training, sterile equipment and good materials to be done in a proper manner for the best results, trust me see a Professional Body Piercer.