Arrange and hang up to 40 pictures in our apartment

Hang up art in our apartment! We have many framed paintings and photographs, varying in size. Nothing is heavy, there are just a lot of pieces. We will lay them out in the general area we want them hanged, and you'll attach it securely to the wall in an aesthetically pleasing way, including in a few places as a "wall gallery" arrangement. We are open to rearranging if you have better design ideas.

Our walls are drywall. We will provide a picture hangers, stepstool, and a hammer, but if you have your own supplies please feel free to bring them.

We'd like this done on:
1/2 morning or later afternoon. We might also be able to do 1/3-1/6 with special arrangements to avoid a sleeping baby.