Opposite signs in surgery

Hello!

I recently read -

“Try to avoid having surgery on a part of your body that rules the sign the moon is in on the day of surgery. For example, Aries rules the head, teeth, tongue, and arteries so you would want to avoid dental surgery (as one example) when the moon is in Aries. It is also recommended to avoid the opposite sign as well so this would be Libra in this example.”

What will happen if you schedule a surgery on a body part that is ruled by the sign moon is in?

What will happen if it is in the opposite sign on the day of surgery?

Thanks