
You need a large piece of butcher paper, large enough to cover the area of the grouping. Then arrange your pictures or items how you would like them on the wall. Trace the outline of each item and be sure to mark the placement of the nails. I usually trace on the bed so that the pictures or items leave an impression on the paper (and it also helps mark the nail placement).
Locate the butcher paper where you want it on the wall.