Knowing more about cicadas, whether they can hurt you, and if you need to protect your plants, can give you information to prepare, if needed.
Cicadas are not otherwise harmful. They will not bite or sting you or your pets because they do not have stingers nor biting mouthparts.
People with entomophobia(fear of insects), however, can undergo therapy (which includes a physical examination of cicadas) to cure their phobia for Cicadas.