The Scrap Shoppe offers this trick for hanging picture frames: hammer a nail through a clothespin and use it to determine nail placement. Simply hang the picture on the clothespin nail, figure out where you want to place the frame, and then push the clothespin into the wall to make a small indent.
Tired of guessing at the location when installing picture hangers on the wall? The problem can be solved by applying tape to the frame’s hanger, and then pushing a thumbtack through the tape as shown here. Perfect Placement. Next, position the frame and push the tack into the wall to get a precise hole for mounting your picture hanger. Remove the tape and the tack, and you’ll be able to hang the frame exactly where you wanted it.
How to Hang a Picture Without a Hanger - Materials: Frame with a cardboard cardboard kickstand (allowing the picture to prop up on a table but not on a wall) Scissors Ribbon or Twine