The grenade ring is just like a key ring. Hold spoon, pull pin, twist ring off the lock, re-pin grenade, walk away with your new grenade, and enjoy.

I had a sinus surgery for polyps. First off, thankfully, I was unconscious, and secondly, it was a near fully automated procedure. They did a CT scan of my sinuses, used it like a GPS map, and the machine just does its thing while being over seen by the surgeon.