You don’t have to own a gallery to learn the secret to hanging art. Just heed these tips from David Kassel, owner of ILevel, NYC’s top art-installation consultancy. Need something to hang? We’ve got plenty, from Kings Wood Art's fiery color-swirled prints to artist Jen Lee's signed works. If you still want to leave framing to the pros, pick up a deal from first-rate NYC framers J. Pocker.