Good for you for wanting to get better than just using a Gaussian blur.
Something that's important to note is that there's not a single action that will work well for every face. Real skin retouching can't be done by a handful of clicks or a quick action. You can use an action to set up layers for your frequency separation, but even this is not a universal solution; you may need to build different actions for different sizes of portrait (e.g. a headshot will need slightly different setup than a full-body shot).
The most important task to learn is to look at a portrait and identify what needs to be fixed or retouched. Is it...
- Heavy or uneven skin texture?
- Uneven coloring, splotchiness, red spots?
- Shiny spots or oily skin?
- Yellow or veiny eyes?
- Hair problems such as thinning, unevenly coloration, many flyaways, distractingly bright hair part?
Since these things are unique to every face, and to every photo of every face, there's no one-size-fits-all action that will automatically give you high-end results.