I'm not a waterfowling expert by any means , but i have been doing it seriously for going on 3 seasons now and have killed a few birds , nothing compared to some of the real experts on here but each year i have killed more and more birds which is a good sign i think. Anyways my only calling advice is to listen to the birds. On days that they are very vocal and you hear hens going crazy at first light you can be more vocal and expect way better results. On days were you don't hear a single real bird quacking your fake quacks really dont matter IMO. I love it when calling works though nothing like pulling a duck that flies past you and making him do a 180 right into the spread.