Print out the free solid-heart stencil pattern, and tape the pattern to the side of your cleaned-out pumpkin. With a pin tool, pierce along the heart outline, creating tightly spaced pin holes in the paper and the surface of the pumpkin.
Remove the stencil after the entire shape has been outlined and cut out the shape using a thin, serrated knife to saw along the pin holes.
Pop out the heart shape by pressing on it from the inside of the pumpkin. Discard the carved piece.
Place a battery-operated candle inside the pumpkin cavity to brighten your design.