Relatively easy way to blur distracting backgrounds
1. Duplicate the image layer by dragging the palette image layer down to the new layer icon.
2. With duplicate layer active, Filter>Blur>Gausian Blur. Blur image as desired.
3. Add layer mask to the blurred layer by clicking on the second palette icon.
4. Reset colors to default Black and White.
Using a medium soft Black paint brush, paint over the subject to reveal the sharp base image.
Use 100% opacity for less precise work that is away from subject edges.
5. As you get nearer the subject edges, reduce the brush size, opacity and softness for gentle transition between layers.
Zoom way in for accurate brush strokes around the subject edges.
6. Switch brush color to White to correct errors.
"x" key toggles foreground and background color back and forth.
Save with layers intact for later revisions, or flatten and save for smaller file size.