First and above all else, while using any of the spells to cause abortion, you should anticipate a failure. Conducting this ceremony at home without understanding how our universe works, what forces it is loaded with, and what ethereal beings surround you is akin to putting together dynamite using household chemicals. It's not going to work.
Even if it succeeds, you'll very certainly injure yourself while never reaching the outcome. It's another story when you're aided by a skilled black mage who can guarantee the woman experiences a miscarriage.