Question: how to find your ring size without going to a jeweler?
Answer: Step 1: Cut a thin (and long) strip of paper.
Step 2: Wrap the paper around your ring finger just below the knuckle (you'll want to make sure your ring can easily fit over this part).
Step 3: Once it's snug you'll want to mark where the two ends meet with your pen or pencil (see photo above)