John,
Some people are more visual than other. To imagine what we should do will come in time if you find it difficult at the beginning.
When you are not practicing the Qigong, try to give yourself time to remember the happy events in your life. For example, how happy you are when someone smile at you or just come over to help you. How happy you are when the weather is nice and what you were doing at that moment.
In time with the guided meditation you will be able to imagine the guided imagines and get much more benefit out of the whole sequence. Everyone works at a different pace. Keep at it, you are doing fine and will get better.
