The title of your intro lured me in...Scared.
Scared, Fearful, Anexious and Stressed...Any one that truely is on the brink of a major change is feeling all of those and more. IT IS OKAY!
Embrace it, we fear the unknown instectively. However the known outcome of the alternative to quitting is scarier. Read the Tom Kern story, if you havent.
Scary, yes because you are looking at it as an outcome. Quitting is a daily action. This is why we only do things one day at a time (odaat) here. We all can do anything for a day. We quit for today. That's it, no more no less. Keep focused on today, tomorrow will be here soon enough.