One thing no one touched on is that before starting on a restoration such as this one, scan the image at the best possible setting (contrast, saturation, and hue), and the highest permissible resolution. Make sure the platen is lint free. Use a photo lens cleaning cloth to do so (never use paper towels, including kleenex, or regular hand towels).
300ppi is satisfactory, but 600 or higher is better. The upside to doing so is, it allows more detail reconstruction and repairing, particularly around rips, folds, and tears. The downside is larger resolution files require a lot of memory and processing, so a powerful PC is a must. (A good excuse to have the significant other, or anyone agreeable to your hobbies, purchase a more powerful computer)

Then when you go to print or have a digital photo remade, you'll be glad you did.
_________________
"In order to attain the impossible, one must attempt the absurd."
~ Miguel de Cervantes