Remember, everyone falls at least once when learning to use clipless pedals. Some, like, err, me, fall, um, twice. I'm sure some fall more.
Heck, you probably remember falling when you started using toe clips.
So don't let falling 1X, 2X, 3X etc turn you off those clipless pedals. Sit on the bike, stationary, can you clip in and out without much difficulty? If so, the pedals are fine and your falls are normal.
Adjust the clips to loose. Get back on the bike. Start unclipping whenever you "might" need to stop - it will become a habit, just as you are in the habit of putting your finger on the brake lever whenever you might have to brake. Give it a few more falls before you cry uncle.
I don't have Look pedals, so I can't speak specifically to those, but I also echo the advice above.
My first clip-in pedals were SPD/mountain bike pedals. I fell the very first time I went out to ride--and nearly fell right into a cactus. I learned my lesson, and I always begin from the other side of the garage. I probably fell 4-5 times due to not unclipping over the first 2 weeks, but then things started to get better.
I recently upgraded to Speedplay pedals. I was told I may fall, have issues adjusting, etc. But so far--knock on wood--no falls since switching. I did recently take a vacation and was off the bike for a few weeks...had some close calls on my first ride back.