I’d like to disagree slightly with my learned Sydneysider friend. In Victoria, and I believe that the process is similar in most states, to be considered a legal practioner in most Australian states, you must hold a practising certificate. This certificate must be reissued every year, based on your completion of the educational / experience requirements (LLB, articles of clerkship), as already mentioned. However, there are additional requirements such as trust fund reporting and audits, as well as compliance with the ethical rules of the profession, and a fairly nominal fee.
So, a major ethical breach, or a bit of embezzlement, and you’ll lose your certificate and can no longer be considered a legal practioner. It’s possible to be readmitted, but I don’t know the process. If you’ve lost your practising certificate (I knew one semi-retired lawyer who merely let his lapse), you can still perform certain quasi-legal tasks eg the drafting of wills under certain conditions, but you cannot give legal advice.