When you provide first aid, based on your up to date training, you have nothing to fear legally in helping another person. The general legal principle is that a person who renders first aid is expected to act reasonably and with a genuine concern for the best interest for the casualty.
As a trained first aider you are expected to provide assistance based on the Australian Resuscitation Council policies and protocols; in doing so you will have nothing to fear when you help another person in an emergency. Always gain consent from a conscious casualty prior to rendering first aid, consent may be assumed from a person who is unconscious.

Further discussion on legal considerations including Duty of Care and Negligence will occur during practical sessions.