Wearing a nipple ring is the same as wearing a tongue nail, a umbilical nail and an eyebrow ring. When you wear it, use tweezers with two eyes at the front end to hold the part (nipple) that needs to be perforated, even if it hurts a little (because it will hurt less if you wear it like this). Then use a hollow needle in the middle to pass through the two eyes of the tweezers at a suitable position, put it on and stop, and put on the sterilized nipple ring (usually used when wearing)
Usually, puncture is not anesthetized, and it is mostly the pain that the human body can bear. Even if it is anesthetized, the effect is not great, so it still hurts.
I don't know if wearing a chest ring will stimulate breast development (I heard that touching and massaging breasts often will make breasts develop, but stimulating nipples will not), but it is inevitable that it will have a certain impact on life. A buddy said that a sister he knew had a perforated nipple when she was in America, and she couldn't even sleep. Finally, my sister cut a tennis ball in half and slept with it buckled. So it's probably not convenient to get dressed after wearing the nipple ring, but maybe it doesn't matter if you get used to it after recovery.