I shore dive once a week and always put my fins on in the water making a figure 4 with my legs - mind you I don't have to carry photography gear etc. The issue with walking backwards into the water with fins on is that the topography around here is changeable near the shore, so you can find yourself taking a step backwards onto nothing. I've just got basic pocket fins with side release clips, which I slide on over my boots (in my limited experience people only shore dive without boots once!) and then tighten, often using my mask to look at what I'm doing. I don't clip them to anything but loop them around my wrist, haven't lost any yet (but there's always a first time!).
All the best
All the best