I fairly new to turkey hunting and some years have only had a weekend or two to hunt. What I have found to be very consistent is:
* when walking and calling, don't call unless you are prepared to sit on the spot and have a good spot to sit.
* set up is crucial e.g where you sit and how you sit. Too close to edge and you have no way to adjust once the bird is in shooting range, too far and he sees you before the game starts, not enough cover, you might get lucky and if you aren't comfortable, it is a mentally and physically stressful which leads to mistakes.
* soft clucking and purring is absolutely deadly on birds that go silent, you just have to have patience.
* walking in and later walking out knowing that I've had a good time and learned something new is what it's all about for me.