Play around with different layouts on the floor to see which you like best.
Trace everything onto craft paper, cut out the shapes and hang the craft paper on the wall to test out the planned layout. Be sure to mark the hanger on the craft paper too! This is a great chance to make any changes before banging any holes in the wall!
Hammer your hooks and nails into the spots you marked on the craft paper. Remove the paper and hang your pictures.