Step 4: Here's where the tricky part comes in that will require a little bit of practice and a whole lot of patience. Position the Background Eraser so that is slightly overlaps the edges of the object that you want to keep. The image below shows how much you want the tool to overlap.

click to enlarge
Now, start tracing around the object with the Background Eraser and you'll see the background of the photo start to fade away. It's a good to perform this tracing step in short strokes, stopping and starting several times. That way, if you make a mistake along the way, you can use the undo feature to remove only that last little stroke instead of having to start over from scratch.