This in not an original idea, I got it from Amy Sheffer who got the original template from Michael's and modified it as well. Click below for the template and video tutorial.
Click here to view the video. For a higher quality viewing, press the HQ symbol.
I'm working on getting a PDF embedded so the measurement is accurate. In the mean time I'm hoping you can just click on the attached image and print it on a full page for now. Keep checking back for updates!