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Tell them you specialise in a different field. If they ask for property advice, say you do criminal law. Or you may make up something fancy that can just go over their head.

It works.
Legal advice isn't a rocket science. Don't get overwhelmed with feeling of entitlement. Be grounded and give them advice.
Give free legal advice but make it known that you are doing them a huge favour. Make them feel good about it, so that they refer you work in the future.