In the mean time wash it with liquid antibacterial soap (bar soap harbors bacteria.) Try not to touch the area, touching it can cause it to become infected. My friends and I used to pierce each other all the time when we were in high school. You just have to make sure you sanitize the area before, use a hypodermic needle (they are sterile and the hollow middle takes out the skin so there's less chance for infection), and it also helps to have a friend there to help shove it all the way through if it gets stuck lol. Call around tomorrow and see what a few places say, I don't see why they wouldn't finish the job. It may be slightly more painful since you already stabbed it today, Good luck!
That wasn't the wisest thing to do. Go to a shop tomorrow and see what they say. A self-piercing can carry risks.