Everytime I paint my nails, I get nail polish on the skin by the sides of my nails.
As you paint each nail, pull back the sides a bit with the other fingers on the hand being painted. It’s hard to explain but it works.
Always keep an orange stick and nail polish remover handy. If you get any polish on your fingers, dip the end of the stick in remover and gently scrape away the excess polish. (I use a stick instead of a q-tip because the cotton fibers can get stuck on your freshly painted nail)
When your nails are dry, use a generous amount of hand lotion around your nails. With a fresh orange stick, gently scrape away any excess polish. This is a little more gentle than using nail polish remover on your skin.