How do you perform bondage on self?

You need to be more specific in your question. What's the scenario? What kind of bondage are you wondering about? What type of material? Etc.

If a girl is alone, she can easily tie a wire around both wrists, and use one of her hands to tighten it. Same with string, yarn, etc. If not the person with her can.

If using tape, she can just use her teeth to wrap the tape around her wrists.

I'm afraid you need to provide more info though if you want a more detailed answer.