Michael Rather has produced a short video tutorial tht demonstrates how to simulate a B&W infrared film effect in Photoshop. The technical content is OK. The subjec matter, snow and water, is not the best example. Something with blue skies and green vegetation would be a better example to demonstrate.
As Deke says, "Masks tend to intimidate a lot of people." His video lesson demonsttrates how masks are pretty much the modern, digital equivalent of the traditional stencil. You affect what's inside the areas that the mask doesn’t cover. Deke covers the mask basics in this downsampled podcast from his lessons for Lynda.com.