Septum Piercing? How to? Any Tips?

I really want my septum done, like terribly. It's easy to hide for when I get a job and what not. But I'm thinking I want to do it by myself. I'm terrified of needles and letting other people poking me with needles. How would I do it? And where? I have Hollowed Sterile Piercing Needles, but I'm not sure exactly where to do it? I don't want to do it too high or too low. Any Tips?