Lay out your art pieces on a large flat space and arrange them into a gallery.
Place each piece of art on some brown Kraft paper, and draw around it on a pencil. Cut out a paper template for each art piece.
Mark each template with a x where the nail needs to go to hang the art.
Tape the paper templates onto the wall and adjust the spacing, also making sure they're straight.
Once you're happy with the arrangement of the templates, use a hammer to place a nail into the wall through the paper template at the spot marked with an x. Remove the paper and hang each art piece.