You can vary the procedure at many points if you feel comfortable. Varying lets you make more complex puzzles or create different ways to apply the path results. For example, stroking and applying a slight blur feathers the application more, and using feathering tricks (such as controlling the fall-off with curves) can create a more realistic look.
Applying the pattern with highlight and shadow masks probably creates the best results in most images, and tends to look the most realistic. Just apply the emboss filter to the simple mask created in Part 3; then use that embossed result to mask off highlight and shadow areas. (This technique is further described in Special Edition Using Adobe Photoshop 6.)