I was terrified when we put mine on, but I had been using them on my spin bike, but of course your not in motion on on your spin bike!
I took one fall and that was because DH distracted me....that's right I'll blame it all on him
But, in no time it was not problem they pop out easy and I can't imagine riding without them now, you really do feel part of the bike once you are clipped in.
Good luck, and have fun!!