Good

- on the understanding and the decision

Get some help if you've not ringed before.
My method is:
Lie/sit the little fella on his back on your knee, head towards you.
Get the elastic band on the applicator and stretched wide.
Lower into place, still stretched wide, pull sac gently into place, check nipples not going to get caught in - right hand.
Squeeze little balls, retracted in fear, back into sac with left hand and close applicator with right hand.
Roll band off applicator.
Even lambs look pretty concerned and hop about/go and lie in a corner - understandably.
Goats being way less stoical will probably yell like mad and you will want to cry. He will be fine so get out of earshot and stay that way for an hour or so, then pop back and check on him.