I found someone to give me a lesson. It cost $90.00 but it was money well spent. I had already fallen and it hurt BADLY.
What I really had to learn was to unclip before I applied the brake. That's the main part i needed know. After 100 years of riding a bike, I knew I had to apply the brakes first to stop. that's the whole sequence. But now I had to learn a new thing.
So try just clipping in one foot. and for goodness sake, make sure the things are at their loosest set point. worry about tightening them up later (I like them loose!)
When i was first learning this, i clipped and unclipped constantly.
And in an emergency, if you can't just pull free, they're too tight!
i hope this helps. It took me years to get to the point that i was comfortable with my SPD's