Lately, I keep seeing taxidermists bring up hand and finger pain from holding tools too long. I had the same problem last month after a bunch of small mammal mounts. My thumb would lock up halfway through sewing. Started doing these simple hand stretches I found online before each session. Just opening and closing my fists for a minute helps a ton. A guy in my local club said he switches tasks more often to give his grip a break. It's weird how we focus on the animal but forget our own bodies. Now I'm way more aware of my posture and take short stretch breaks. Makes the detailed work like setting eyes way less of a pain, literally.