I don't claim that my way to do a gallery is perfect or even the best; but it works for me. Here's what I do:
First, I lay out all my frames on the floor and arrange them the way I want them to go on the wall. Then, I cover them with wax paper. Why the wax paper? You'll see in minute.
Next, I tape the wax paper together. Wax paper and Scotch tape don't always play nice together, but it was all I had at the time.
Then, I lay out the frames on top of the wax paper. I moved into the entry way because I needed a hard surface and my counter top wasn't big enough. I take a Sharpie and mark where the nail holes go. I also trace around the frames to give me a reference point later.
Because I have freshly painted walls and it pains me to make nail holes in those pretty walls, I use a lot of these Command Strip Picture Hangers. They are a lifesaver, wall saver, and sanity saver all in one. They make hanging pictures super easy. However, there are some things that I just feel need a nail. Like the heavier frames and the canvas.
Okay, now for the next step. I position the wax paper on the wall where I want my photo gallery to hang, and secure it with tape. Then, I turn off my ceiling fan because, well, the wax paper just wants to dance. I
After that, I hang my pictures, stand back, and admire my handiwork (after turning the ceiling fan back on, of course)!
Don't you just love that little sign? My father-in-law bought it for me, and I was so honored, I just HAD to hang it up with my gallery!
I'm planning to hang at least 1 or 2 more gallery walls in House No. 3, so I will post when I do!