[Markulous]

Speaking for myself, I used to use High Pass filter to sharpen as the final editing process after sizing for end usage (print or web)

Now use Nik Software to sharpen at end of edit but occasionally, should the image require it, a RAW sharpen at the start of the edit (usually where there's not a lot of detail and relatively low contrast, so requiring a 'boost' to bring out the subject).

Advantage to Nik Software is that it creates a separate layer where I can 'paint' in the sharpening to specific areas or erase some of the sharpened layer - whichever method, like selective colour (which some call colour 'popping'), I have total control of what and where the sharpening is applied

How much to apply? As much as is needed to bring out the detail at whatever the finished image size might be (and to that end, I use saved settings according to lens used and final image size/use - but only as a rough guide as individual pics vary in need for degree of sharpening)