As a miss ding player myself I have found that moving the marker to aim is just as much guess work . Also moving the marker to aim does not always work either depending on the wind speed . For low winds I never move the marker and only when on the high moderate end is it needed . You will have to practice to learn how to use the marker for aiming .
One thing I have noticed though when using the marker to aim . If the marker is touching the rough bunkers water or any area other than the fairway , the meter will spike severely causing mis-hits and errant shots .This will happen a lot when playing in high winds and using the marker to aim and adjust your shots .
Use the free ball in practice setting just to get the general idea of how to play using the aim marker and place the marker in the areas mentioned and watch what happens . Once you get the general idea down then you can start using your regular ball for play .