That might be the easiest way for you. Pay a millennial to do it for you.
I shot a photo of my neighbor's rear plate straight on. I made a copy, and used Paint to fill in the registration stickers on the copy. I then used Snipping tool in Windoze to cut the plate images from the larger photo and pasted them into Word. As Kurt said, US, Canadian, and Mexican plates should be right about 1/2 inch wide, and Word has a built-in ruler. I then printed them on photo paper. I have a pretty nice Canon printer / scanner at work. Better than the HP I have at home.