I get fewer stings now, but I think the main reason is experience, not confidence so much. I use a lot less smoke. I don't smoke before opening the hive and I don't lift up the roof and puff smoke in. I was taught to smoke the entrance before opening the hive and I now think this is the wrong thing to do. It gets the bees to move up then you smoke them down again! I also have a better sense of how the bees are reacting to the inspection and respond myself. Some of it may be confidence, but mostly experience and skill. And the good thing is that all those stings in previous years have left me immune - well
mostly