My question to that would be if you are capable of visualizing in your minds eye in the first place, why would you visualize yourself above your body? You are just wasting your time and energy.
You are not getting the concept if that is how you are trying understand it. If you already know/can use your minds eye then by pass all this. You project with your consciousness to where you want to go or for whatever reason. IE, intention. you need an intention. What you perceive via your minds eye is where you have projected too. It's a myth that astral projection or any projection for that matter requires you to be in a sleep state or semi xyz trance/alt state. Because there are those who can do it just by projecting their consciousness and using their minds eye. Maybe better known as Remote viewing.