Nice! So pretty much based on the tutorial, you start with your image. You determine which areas you wish to convert. Well actually, since you're converting the entire image, you determine where you want your image to pop out and which areas you wish to remain. Do this by a roto shape around the desired area, and a bit of control for your white to black values. Remember that more white is toward the camera, and the darker values are farther back. Then, using a Card, attach a DisplaceGeo node to get your 3D geometry.
Now this is the part that screws me up. After your DisplaceGeo node, create a Scene node. Connect after the DisplaceGeo. Next, create two Cameras. Name and respectively place each one on opposite sides of your Scene node. Name left and right. Under each respective camera, create a ScanlineRender node. Use a JoinViews node, followed by an Anaglyph, and that's the basic premise. Don't forget to set your project up for stereo in the views tab!
Also, when you get to the end and you're looking at your Anaglyph node, you'll notice that your image is black and white. To get your color back just in case you're lost, there's a slider in the Anaglyph attributes that defaults to zero, that will allow you to view all of your colors again. Not hard at all!