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To do that see my post #5.

To remove the noise make a snapshot of the picture by selecting the top layer and press shift+crtl+alt+E.

This will make a new layer from the underlaying layers.

Turn that into a smart object, go to raw filters, set the sharpening tools to 0 and start working on reducing the noise with the luminance slider.

When you think the noise is gone enough (except face), use the layer mask to brush away the face so it becomes sharp again.

Now you have a sharp face and removed the noise from the rest.