The best thing about rotary shavers is that they are able to deal with the thickest of hairs and the longest of beards. One trick to shaving through facial hair and, especially, thick facial hair is in the technique. With a rotary shaver, it’s best to shave in a circular motion, instead of the usual up and down motion. If you shave in an up and down motion with a rotary shaver, it will result in your facial hair feeling like they are being pulled out, and this can be quite painful.