Feeling like a clipless idiot!

[Trek420]

My first commute with clipless I must have unclipped 200 times... whenever I slowed down, whenever I stopped, whenever I thought I might have to stop, whenever I even thought about stopping, and just for practice...

You can practice by finding a safe stretch where you won't (probably) have to stop, and just clip and unclip, pedal a bit and repeat, over and over. Pedal, unclip and stop, pedal, unclip and stop. It does become second nature, and you don't have to fall over many times. Maybe you've already "done your time" on the ground

What she says. Until it's such a habit that you unclip/turn your foot when getting up from a chair find a quiet stretch of road and just clip and unclip for no apparent reason, sometimes stopping, sometimes just pedaling and clipping in and out .... left foot, right foot, at the 9 o clock, 6, 3 .... all parts of the pedal stroke.

Does not take long for it to be a habit.