Trying to understand what it feels like to make an unconscious decision without the background to make that decision consciously is not going to help you. You need to learn manual before you start thinking about scenarios and what your unconscious behaviors will be. Simply understand that as a good driver of a manual transmission on a regular basis, your foot will not come out, off of the clutch, without your other leg giving the car some gas.
This at worst will result in spinning tires, or at worst, you pannicking and roasting the tires, crawling into oncoming traffic to your doom.
Odds are, that if you achieve the status of a "good driver" with a manual, you will at most spin the tires a little when you screw up.
We all stall once in a while, so keep in mind that Darwin is a sly devil