The idea is to notice the feeling without naming it. Whatever it is whenever you feel it or are doing the feeling exercise.
For the most part when you're doing it with the CDs the idea that comes to mind is "I feel nothing". In reality it means you're trying to label the feeling instead of noticing the buzzing in your, head, your relaxed breathing, the pressure of your body against a surface, the itch on your nose or whatever sensation you are having.
Noticing the feeling of confusion, frustration, awe, happiness, sadness, anger, or simply being without labeling them.
The paradox for me is that to explain it I need to resort to labeling possible feelings
Instead let the mind go there and be aware of what happens in your body when you experience certain feelings.
So when Paul says notice your feeling the trick is not to go "I feel" but to allow the mind to travel to the, probably strongest, sensation that you are aware of in your body or emotions and if your mind says "I feel" know that you are trying to labeled it. Instead let go and feel that 'nothing' be in it let it flow over you and just put your attention on feeling those feeling we quickly jump to label. When you manage to move beyond the words you will find that your body vibrates with energy and by feeling you know when the energy is flowing and when and where you are blocking it.
Alex