I've only led one trip and wanted to get comfortable leading more trips, so I attended the PSC class led by John Chase.  Great class, with lots of interaction from all the participants (many of whom have led numerous trips, so had lots of good tips).  It was a well organized class and covered the majority of items necessary to lead a great trip, plus addressing possible issues that might derail it.  Well worth my time and I look forward to leading more trips this year.  Hope this is offered every year (along with the boat repair class, which I now wish I had signed up for)