do I imagine pulling the body lying in a horizontal position or pulling the body in a standing position?

[CFTraveler]

I see. I need to imagine that I am in an upright position, leaving my body from the top of my head. thank you!

You don't have to imagine you're coming out of your head. The energy body doesn't have 'holes' you come out from, it's best not to think of your body at all. You're insubstantial when you come out. I do the visualization as if I were sitting up because it's a more natural way of thinking of going 'up', but it's just my convention, not 'the' convention.