Failure to hold the required licence when performing electrical work can lead to unsafe work practices, on-the-spot fines and can void the building insurance.
To ensure that your electrician is licensed, the Queensland government have a website where licence checks can be performed. Visit their site here: https://fswqap.worksafe.qld.gov.au/elis/
In the event of a breach that causes death or grievous bodily harm, those responsible can expect hefty penalties including jail time. This includes those performing their own electrical work. Don't risk it.