It is important to choose ones Gods and Goddesses, and research them thoroughly, before performing any magickal working?
Just as a person wouldn’t want to try to eat a mushroom if he or she was uncertain about its poisonous potential, so a magickal practitioner will avoid “rushing in” to a working with a particular God or Goddess without knowing the background of those deities. It may sound like fun to invoke Kali, but it isn’t necessarily wise. The Gods are not playthings, to be used and discarded at a whim. One must establish a relationship with them, much as one nurtures a friendship. Asking their assistance without full knowledge of how that assistance may be manifested (often in unexpected ways) could cause serious trouble for the practitioner.