It's no big deal. Hundreds of thousands of skiers learn how to get out of binders every year. (same principle) My suggestion is to find a nice lonely place and clip in and clip out while braking. Think ahead, brake, unclip left foot. Do that a dozen times. Same as right foot. I respectfully disagree about setting the binders at it's easiest setting, you'll get use to your foot literally falling out, and that won't help under real riding conditions. I suggest you set the tension in the middle. It's basically a walking and chewing gum at the same time, sort of thing. It will seem a bit awkward at first, but if you ride for a couple of hours, stopping every 20 or 30 yards, alternating feet, you'll be doing it like a pro in short time.
Coincidently, I just helped a friend, who is about as graceful as a turtle on a tight rope, and even I had serious doubts. I thought I might be responsible for massive injuries. and have to explain his demise to his wife and kids.

In an hour, he was waiting on me, and good to go. You probably will fall at sometime or another, it happens to everyone. They get distracted and unclip too late, etc. It comes with the territory. You'll be fine.
Good Luck,
J.