I didn't bother taking a picture of the blank wall before I started. I'm sure you can image a large, blank wall. Got it in your head? Good. I used butcher paper to trace all my frames and mark where the hangers are. Then I used the butcher paper to decide how to place my pictures. This was nice because I could rearrange my pictures without punching a bunch of holes in the walls.
See the little triangle? That's where the hanger is on the frame.
Once I finally had an arrangement I was happy with I started with nails. I actually used use these gorilla hangers because they are designed to hold the weight better and JM felt better about them than nails. I ended up having to shift some things around when I started hanging. You never know what is behind your walls until you start hanging things.
Lest you think this was a quick process, it wasn't. The butcher paper was on the walls for a few weeks while I decided if it was what I wanted. After some thought I bought a few more frames, and made the large blue "S" monogram. It's also a clock; I love clocks.
I also knew I wanted more than just picture frames. I thought it would be too flat with just frames. That was another reason I added the big monogram letter (its a cardboard letter from JoAnns, painted). I also put up a little shelf that will add some dimension. JM was really against the shelf initially, but he liked it after it was all put up. I love the way my wall turned out!