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How To Hang a Wall Gallery
Do this before making a gallery wall. Hold a piece of paper on back of frame and mark with Sharpie where to put the nail-then tape back on wall and nail right through the paper! Voila!
Hang a picture/object level by putting painter's tape on the level and marking where the object's holes are. Put the level against the wall and mark the wall based on the painter's tape markings.