Its actually pretty simple in principle, setup the camera on a tripod and in manual mode, do 1 shot with just the background to give you the scene (using natural light only). Then, without touching the camera at all, place the lawnmower in the scene, and a chair for me to balance on. Then, set the camera to timer mode (10 sec), run into the scene, balance on the chair and pull up the lawnmower to get into pose. Wait for image to fire (this time with a flash head off camera to highlight the subject.
Then, take both images into photoshop, layer them together and clone out the chair, then airbrush in a shadow, add some motion blur where needed and apply my normal post processing techniques to create the final image...
voila
