I use calling sparingly especially early in the season like now when things are still fairly calm and there isn't all that much talking going on in the woods...at least where I hunt. Patience, scouting food sources, bedding areas, and transition corridors, stand placement, and hunting the wind are the most significant ingredients for success at this stage IMO. Keep in mind that trying to communicate to deer can cause more harm than good especially if you are after a veteran buck who has been around a while...he likely has absolutely no interest in a fawn bleating. Also remember that when a deer is responding to a call, they are on full alert with ALL of their senses as they attempt to discern the source of the call which can make it more difficult compared to having a deer within range that is completely unbeknownst as to your existence.