Experience is exposure and environmental specific and takes time to build. Extensive wreck diving experience does not qualify a diver for cave diving and visa versa. Note that the more challenging the dive and the further the dive goes beyond mainstream sport diving limits, the more risk the diver must accept. No amount of training or equipment will completely mitigate this risk. Training Technical training is an ongoing process similar to training for an athletic season or fight training.
Continual practice is the key.
Completing a formal course is a good first step, but is only a starting point. It does not in itself prepare you to make the dive. Always be prepared and trained for the dive you plan to conduct. Perform a risk assessment. If the answer is no to either question, call the dive.