Everytime I show this nifty little tool, those that haven't ever seen it LOVE it! It's called a Stamp-A-Ma-Jig. And for $11.95, you'll find it an affordable piece that you can't resist!
First, line the imaging sheet up in the corner of your SAMJ. Then line your stamp in the corner as well and stamp your image.
Line up your imaging sheet so the image you just stamped is where you want it.
Place your SAMJ at the corner of the imaging sheet, remove the imaging sheet, then line your stamp with the SAMJ and stamp!