How do I get this hoop earring out of my cartilage?

Here is a picture of a similar one to the one that’s in my ear. (The one on the left). I’ve had this hoop in my ear for about 9 years and it’s starting to bug me, especially when I sleep on it. I’ve tried before and I can’t get it out. So, does the little ball screw off, or does it pull out of the ball? Either way, it won’t budge. Do I have to go to a piercing shop to get it taken out?

Also, side question- it’s slightly gauged (thicker than normal earring size). If I ever get the earring out, will the hole ever grow shut?