Take the backing off of the square frame.
Put frame aside.
Fold frame paper in half.
Open the paper back up and measure 4 inches down from the top.
Find the center of your wall and mark it with a pencil.
Use painter's tape and a level (if you want) to tape the first frame paper on the wall.
Take corner piece of the frame apart and use it as even separator.
Tape two separators next to the bottom paper square.
Line up the next paper from the frame next to the separators.
Tape the paper square with painter's tape.
Repeat until all paper from the frames is up in the design you want.
Right through the paper, hammer a hanging nail on the marked spot.
Remove paper.
Add photos in the frame and hang on the nails.
Now you have the perfect grid picture gallery wall with square frames.