One of the toughest things to do in audio production is to create a three dimensional aural landscape that matches the level and tone of the audio with the physical space in which it is created. For example, a lav microphone placed on an actor that you see at a distance will sound very unnatural. Use a shotgun and place it at a distance from the actor, so that the voice matches the distance we see. These will not be equal. The microphone will be much closer to the actor than you might think. To practice mic placement, choose a favorite scene from a movie and try to duplicate the sound you hear.