It will help with that. To cast a curse, you need two things: intention and strong emotion (hate is a favoured flavour of the darkness). When someone is threatening you, imagine that you have a shield made from light, and anything dark repels from it.
If you need something more complex, I would recommend this:
It protects, clears, and works on your physical body. Of all the protections I’ve ever used, this one is the best.