In most cases, you will want to make your own adjusments. If you move the Preview Area , by clicking and holding the mouse down in the filter's preview window, the preview effects of the filter return to the original state. In this fashion you can see the end result of the changes you make as compared to the original. This will help you to make the proper adjustments. A good rule of thumb is to sharpen your image until it looks good, and then back off the adjustment a little.
Most people tend to over-sharpen.
Keep making the adjustment until the image is sharpened without any glaring highlights around the edges of the image.