The simplest way to apply endless hoops is to hook the post to your ears from back-to-front, that way you can easily see where the solid post goes into the hoop. Flexible, Small, Lightweight and Comfortable, just leave them in and forget your wearing them.
Small Sized Round Continuous Endless Hoop Earrings, Great for Second Hole, Lip, Nose, or Cartilage Piercing
12 millimeters in diameter, just shy of half an inch