New Zealand Law
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I believe that for the work of this description, it would be fairly unlikely that you would be exposed to claims for negligence, because training and similar activities are not generally high risk for personal indemnity. But you certainly could include a clause in which you provide that you will not be liable for any claims for negligence, which would provide some protection
You really only need to worry about professional negligence when there is a substantial amount of money at stake. So people like lawyers, accountants, engineers and others who are making decisions and giving advice with substantial financial consequences upon an error, do need such cover. But teaching and being a mentor would be very low risk, while you may want to have an indemnity clause, I doubt that you are really at risk