The picture hanging strips by Command are wonderful to hang pictures. No hammer & nails. No holes in the wall. No crooked lines, no paint pulled off of walls. Target,WalMart, Lowes, and Meijers carry them.
The absolute easiest way to arrange a gallery wall without making nail holes, um, everywhere? Trace each frame onto butcher paper, mark the tightened wire height or hook position, then stick them to the wall with painter’s tape.
Command Hanging Strips If you decide to go with adhesive strips, Dana of House Tweaking has these important suggestions: use alcohol to clean the area of the frame you will hang, use more than just two strips per item.