Hey Beckie, here are the steps that I take (I'm in PSE 12):
1. Flatten Image
2. Resize image size to 700x700pixels
3. I duplicate my image (the layer)
4. Filter -> Other -> High Pass (radius at 0.3 pixels)
5. Change to Linear Light
6. Flatten
7. Save for Web -> Optimize for File Size 400K
That's the way I go about it.
