If you've tried to hang pictures in a grid pattern before, you know it's a total pain in the behind. So, I thought I would post a little step-by-step to show you how we ended up tackling it.
Here's what we needed to get going...
1. Nails etc. to hang the pictures.
2. Laser level (or a normal level, but the laser ones are so handy for this)
3. Two inch painter's tape
4. Tape measurer
So before we get going I want to apologize for the horrible lighting in these pictures! I know I know....
Estimate how high you would like your grid to be using your tape measure, find the center of where you would like your grid to be (I centered mine on our couch), then hang the lowest center tile. Using the laser level, put up a strip of 2" painters tape above the first tile.
Hang the next two center tiles - putting the horizontal tape strip in between again - then put two strips of tape vertically to the left and right of the pictures. The tape is our spacer, so you can be sure you're getting an even grid pattern.
Hang the next six tiles and add two more vertical strips of tape.
Hang the last six and rip off all of the tape! Taking off the tape is the best part :)
(I waited until we had natural light to take this picture - so much better!)
The one additional tool I would suggest (and that I wished I had while I was doing this) is this great tool or one like it that helps you find the perfect nail spot. UPDATE: The inventor of that tool, the Hang and Level, sent me one and a few other products. See what I had to say about them here.
Happy picture hanging!