in SA you need to pass a theory test and then you can get the boat license, which means you can sit the boat. And if you are not comfortable enough you should take the boat handler's course. I personally found there're lots of tricks, not by handling the boat, but towing the boat and getting it into water or out of water, and some maintenance/trouble shooting for the engine/nevigation system, so learn from other experienced people is recommended. Also I would recommend you to learn about communicating with the sea rescue by radio for emergency situations.