Step 1: Choosing your Photo
When choosing a photo you must remember two things.
1: Pick a picture with the least amount stray hairs. The picture i picked does have stray hairs, but there close to her head so it doesn't matter as much.
2: The other thing you should keep in mind is to pick someone that has light hair ex.blonde. I think darker hair will work but not as good.
Step 2: Masking
To do this select the brush tool then press "Q" on your keyboard.
It doesn't have to be exact but you should try to be close.
Step 3: Making the selection
When you've completed the steps above, without deselecting make a new layer ontop of the background layer. Click on that layer.
Step 4: Colour
It should now look like the picture below.
Step 5: Blending
After you picked "Soft Light" press "control" "d" on your keyboard to deselect the selection.