Download Masking Files.zip (Extract1.jpg and Paris River.jpg).
Remove the woman and her hair from the background of the Extract1.jpg image and composite it with the Paris River.jpg Image.
Post a screen shot of your image in Photoshop with the Layers Panel showing and a JPG (File>Export>Save for web) on your web site as Exercise 4. Save and post all of the experiments in masking to Exercise 4.
Lee Varis has an excellent tutorial about making hair selections and masking that is a little more sophisticated than usual and has some very good info and techniques.