So here's the skinny, since the tutorial was kind of vague. Using black construction paper, I cut a three inch circle to fit the diameter of my 50mm lens. In the middle of the circle, I cut out a 1 3/8" heart. The heart in the tutorial appears much smaller, but I think the heart has to be big enough not to crop your view through the viewfinder. I cut a 10"x 1" strip for the cuff, then wrapped it snugly around my lens and taped the strip to form a circle. I taped the cuff to the circle, slid the contraption over my lens, and got to snapping.
A few details:
Shutter speed variable depending on light meter.
Focus blurred to various degrees to adjust size of bokeh.
I'm having too much fun with heart shaped bokeh, and I'm dreaming up all the different shaped bokeh I can make with this simple technique. Thank you Maya for the inspiration! And happy heart day to everyone!