I am a professional in piercings/tattoo/scarification. Take my word for it - after years of being a fool by piercing everything on my own, I have learned to leave it to the pros. They know hygiene, and they know what's safe to put into your body.
I wouldn't recommend piercing your ear on your own, it can become infected and make you sick, I would suggest getting it pierced somewhere clean and sanitary. If your parents try to stall you, you should just walk over and get your ear pierced.