It can sting. A little. If injected slowly, through a small needle, under low pressure - it's much better. Fortunately, it works quickly.
Yes, but less than. Surgery without anesthesia! it's just a tiny needle stick and a bit of a burning sensation as the local anesthetic works--and it works almost instantly! it's truly the lesser of two evils; even a mole removal would be too uncomfortable without local anesthesia, so buck up and do not fear theneedle of local; it's really better and easier than you worry about!