Y. C. The safety pin idea is OK for storing rings providing it is fine enough for them to fit. Another method is to thread them on a paper clip which does the same thing.
The difficulty in using tippet rings arrives when removing them from whatever you are using as a holder, they are still easy to lose. That's why it's better to tie them on at home. Using a table with a white cloth also helps if you drop one. Gripping the ring with a pair of small forceps is easier than just using your fingers, the downside of tippet rings is that they are so darned fiddly to handle.
It's easier after a bit of practice