Leslie I have been unfortunate enough to spend more time in Jhb central at the CCMA than I would have wished for. Whilst I have always been defending ( as the employer ) I can concur with the excellent advice give by
@AdrianB. Some of my observations:
1. Never let the situation get emotional regardless of what is being discussed. The commissioners have seen it all before and although it may be life and death to you, its just another case to him/her. I have seen many judgments affected by unreasonable behaviour ( shouting, gesturing, crying, sulking etc etc). These commissioners generally know their stuff and act on cold hard facts. Who presents their case best normally wins.
2. Be respectful at all times to all parties at the hearing, even to your employer! Commissioners always nail people who come across as anything bordering on arrogance/ indignant / aggressive / confrontational. As
@AdrianB says, stick to the facts and keep it as dispassionate as you can. Theatricals are seen as weakness regardless of what side they come from.
3. Be 100% sure of your answers before replying to questions asked. It is far better to ask for a minute to check your notes / gather your thoughts than make an incorrect response. Your integrity is paramount and the commissioner will appreciate you being thorough in your answers to him/her. Honesty is always the best policy.
4. Get there with plenty of time to spare. You will be amazed how many cases I went to were thrown out because the other party was late. These guys have no patience and when you see the crowds you will understand why.
All the best.