I wouldn't say afraid, really. When I first started using them (SPDS briefly and then Look Keos), I recognized that there was a learning curve and that I had to exercise a bit of patience with them and with myself. The SPDS were pretty easy, but I didn't really like them. The Keos took some practice in a parking lot. When I first had my LBS install them, I practiced them in the shop while on a trainer. It seemed pretty easy to get in and out of. My first ride with them was slightly traumatic in that that the tension was set too high and I could barely clip out. There were a few tense moments, but luckily I was in a park and I did get my foot out eventually. I learned that how easy a pedal feels on the trainer may be different on the road.

After a few practice runs, I really haven't struggled with them since. Every once in a while I'll have a ride where my timing on clipping in is off, but clipping out has always been pretty intuitive. I've had one (knock on wood) fall and that was because I had unclipped the foot I normally don't unclip for a stop because of a bad hot foot and it just threw my muscle memory off.