- patience
- Camo is essential, but movement will bust you quicker than a break in the camo
- I find that a mono-pod to rest my shotgun on works wonders. It can be maddening waiting for that Tom to enter your shooting lane. Trying to shift your position with a bird in sight will usually spook the bird (or spook one you didn't see)
- a rangefinder can be a big help. Once you pattern your gun and are comfortable / confident with your personal "effective range" you can set reference points from your hunting position for when to shoot and when not to shoot.
- sometimes a decoy or two is a big help (and sometimes they are not) - not essential, but something to consider
- I like to have more than one call (or type of call)... sometimes they like the sound of one over the other, for no apparent reason.

Good luck!