I practice a lot. The inside of my right thumb has a tendency to get blisters. My first line of defence is to put a bandaid around my thumb with the pad of the bandaid on top of the sore area. Then I wrap a piece of medical tape around that to make sure it stays on.

Bandaids and medical tape help prevent blisters on my thumb.

If I’m past the point of no return on blisters all over my hands I resort to a golf glove. I use fingerless ones in warm weather and regular ones in cold weather.

Golf gloves can be used for blister prevention when playing tennis