There are also silicone plastic thimbles being made and they are quite inexpensive.
Sounds like you may have a bit of a coordination problem. Much of sewing is about learning the manipulation of the fabric. Mom sat me in her lap to play with needle, thread and fabric as an infant. I was well into my 40's before I watched her "help"me reupholster my sofa and learned how I had been improperly handling the fabric on upholstery jobs for years. Literally took 20 seconds!
Think about watching some Youtube videos, and consider keeping a stash of fabric ready to practice on from time to time. Starting with easier scraps and graduating to something like a rayon challis.
Anything placed on the left hand will most likely feel cumbersome. As you hem, its important to realize you should only be grabbing one tiny yarn of the side of the fabric that will show. If you are constantly pricking yourself, you may be grabbing too much fabric.
Good Luck!