I had a bit of a problem making sure the grid and photo's were even and still the size required for the assignment. Since I used my Nikon, my original pictures were 3872 x 2592 so it took a bit of trimming.  Even with a tripod, human error made sure I wasn't always centered and it's surprisingly hard to photograph your thumb. Since I set myself up, I didn't have to do much adjusting. I used the same background, light box, shutter speed and about the same aperture for each picture.
I would like to add, that I am absolutely ecstatic that Windows 8 has this nifty auto save feature since my lovely toshiba fell off my lap and somehow restarted itself. This saved me from losing a 4 page research paper, this blog post, serious research on exactly what qualifies a person a "cat lady/mister," and directions to the closest farmers market.