I used the pedals that tctrek suggested on my Trek FX (my first bike as an adult) and they do help you get over the worst of the adjustment. I went straight to Look Keos on my raodbike though and had the same dread that you had. I actually went back to the LBS with every intention of returning them, but they talked me out of it.
So, with that pep talk, I went to the nearest parking lot and just practiced. Loosen the tension on your pedals so they're easy to get out of, and then pick which foot you're going to unclip when you stop. Always use that foot. Always. Routine is key with clipless. Once you get the movement of unclipping down, then work on clipping in.
Practice in the parking lot or grass until you feel more comfortable. Then take the bike out, preferably not with a big group, to a lightly traveled, flat area and practice some more on the road. I promise it does get easier.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher