I did my HSC a few years ago and didnt get tutoring for my IP but as long as you are the one doing the work there shouldnt be a problem.
Ive never tutored an HSC piece, but Ive tutored several other performance pieces and generally Ive found the best way to go about it is to talk to the student about their ideas and where they want to take them, recommend some reading/research ideas, especially looking at production elements, then talk them through the writing process. As long as your tutor doesnt actually create anything, but simply fine-tunes your work and helps to clarify the themes and objectives of the piece, you should be ok.