Calling Reference: I never say call less or more, depends on the state of mind with of the buck. Why are you calling again? To tick him off or mask his nervousness, or to make him horny?
The Approach & Departure: Give yourself plenty of time...when approaching or departing the stand, consider the wind...duh. What about the terrain? Or the lighting? Use shadows, hills, tree/brush lines, etc., anything to hide your presence while approaching. When dark, keep your light pointed to the ground in front of you as much as possible. It is much easier to notice a light from a distance that is being waived around head high. Keep in mind also though that some of these areas you are walking could be the same runways the deer are using, so stay as scent free as possible.