Maybe you should put only one pedal on for now. Which ever one you "don't" plan on unclipping out of when you stop. Just a thought. I didn't do this, since my first experience with clipless pedals was on the back of a tandem and I didn't have to clip in and out very often. It was a great way to learn. But I'm trying to think of what I might do if I were learning now.

If you do put both pedals on, always remember that you don't really HAVE to clip into both to get going. I had to remind a friend of that when she was learning and having a hard time clipping in as she was getting going at a green light. You can pedal some before clipping in, just be careful that your foot doesn't slip off, so be careful how much pressure you use.

Also, whatever you do, practice in a place where you can start and stop often and practice clipping and unclipping. Find a tree or telephone pole or something and tell yourself that it's a stop sign, and then pretend stopping at it. You'll get the hang of it in no time.