The ring handstand - a skill I had never really developed before - has been coming along well these past several months. I still have a lot of work to do to clean it up, but here are some holds from today.
My advice -
1. Learn a regular handstand first!
2. Get a soft mat to crash down on if/when you overbalance.
3. Bending the arms/shoulders and underbalancing will give you a sense of the balance, then work on straightening everything out (and eventually turning the rings out).