Using a shoe horn can ensure that your feet fit comfortably into shoes. It can also protect your shoes from being bent out of shape when you try to put your feet in.
Position the broad blade of the shoe horn inside the shoe and let it rest inside the back or heel part of your shoe.
Gently, slip your foot into the shoe, making sure that your heel is raised. Your heel should also rest against the curve of the shoe horn. Firmly but gently push your heel against the shoe horn and lever the horn so that it pushes your heel and help it slide into the shoe.
Remove the shoe horn once your foot is positioned comfortably in the shoe. Practice until you get it fast and right.