A shoehorn (sometimes called a shoespooner) is a tool that lets the user put on a shoe more easily. It does so by keeping the shoe open and by providing a smooth surface for the foot and the heel to move, without crushing the shoe's counter (the vertical portion of the shoe that wraps around the back of the foot), in this way acting as a first class lever. - Wikipedia
Update: There actually was a single shoehorn instructable.
Step 1: Flatten the spoon
Later on I'll use a small ball pen hammer to pound in a curve. I drew lines on the spoon with a marker to show you the hammer pattern I used.