How to match photos when modeling in Google SketchUp

Matching a photo allows you to import and align the SketchUp axes to match the photo perspective you want to use as a modeling reference. With this done, you can create models using the photo as a direct reference. PART ONE covers the basics of importing and aligning the axis to start modeling in Google SketchUp.
PART TWO cover importing multiple images and modeling from those. Then we show how to start with a SketchUp model, and align a photo to it so you can see your model in it's real-world context.