Christopher,
I viewed your file, and appreciate your generosity in sharing. Many of my students would love to mount their work at home, and your methods are good for folks without much equipment.
I would suggest one piece of equipment to you, that would speed things up, as well as giving you a bit more accuracy; the Falcon print positioner. It's a kind of plastic t-square that allows you to position the print perfectly in a few seconds. I believe it's still available from B&H for 11.95.
If it's allright with you, I'd like to provide a link to the video from my website for my students. Thanks again for making it.
Steven