I will use the high pass filter to add some zap to the image with generally overlay blend at a farily low fill then apply "sharpening" one way or the other.

I do not use in-camera sharpening and on my cameras sharpen is turned off.  Sometimes in camera sharpening will leave halos on images and I simply prefer to do my own degree of sharpening on the pc.

The more complicated method Tanchelyn mentions is one I have used and it works quite well.