A; It may not be immediately obvious to you why you are supposed to meditate on your CR before you try to shift to your DR with this technique. The idea is for you to practice visualizing in a situation where it is easier. Vividly imagining sensory details is difficult if you do not routinely pay attention tothose details and try to replicate them in your mind.  Once you get good at visualizing with your CR, then you will know how to do it with your DR.