I tried every thimble we had at the shop and Joann's, then I was introduced to Roxanne's thimble love them. Roxanne, daughter trained me to size the customer (most shops will permit you to try it a week and if you need a different size you can exchange.
They are expensive....worth every penny. If you never used a thimble you need to give yourself time to get used to it wear it around the house after you stop quilting for a short time until you get comfortable with it. I am a hand quilter.