How to sharpen images with out increased noise?
In LR you combine sharpening with masking. In the Detail panel hold down the alt (option) key while moving the Masking slider to the right. You'll see white areas that decrease in size; these mean that the sharpening is being applied to only those areas. (If you aren't starting with a RAW file, move the Amount slider a bit first.) Once you decide how much/little to mask, adjust the amount. Rule of thumb: don't put the Amount over 70. Then zoom in 200% and tweak Detail and Radius.
In PS, you don't want to use the high pass filter alone. Primarily because it can introduce color artifacts. I suggest you start with Frequency Separation, then move the high pass layer from that to the top of your layer stack. You can google for tutorials on building FS layers.
The other great thing about the high pass layer is that you could then apply a noise reduction tool to it. I use Topaz Labs DeNoise 6, which helps a lot.
Above all, judicious use of sharpening is key. Once you've got your sharpening done, use a mask and only apply it where you really need it: where you want your viewer to look.
That said, how about an example?
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