1. Mark the location of the holes on the wall using the keyhole hangers

 

2. Choose convex head screws & dowels that match the wall type.

 

3. Drill the marked holes, then insert the dowels. Start screwing in the screws as well, but do not drive them in completely, leave a space at the end of the thickness of the plate.

 

4. Hang the shelf on the screws, so that the keyhole hangers are tight.

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(If the shelf moves/wobbles, hang it and tighten the screws more, then hang the shelf again.)