I recently posted a blog regarding pliers to open and/or jump rings.
Even I often use pliers (especially flat nose pliers to open and close jump rings), sometimes I got my hands so tired to hold the pliers. I have carpal tunnel symptoms as well as arthritis. So it's hard for me to hold something in my hand for long.
Lucky I found another tool, The Bead Smith Tools: jump ring opener.
Slip the tool onto you finger, then use the other hand with plier to place the jump ring into the slot which is match ed to your jump ring (there 4 different sizes of slots available). And then twist the jump ring to open or close it.
For me, this is really helpful especially for very small size jump rings.