It's 2 a.m. and something just hit your roof. Or you wake up to a tree across your driveway and you need to get to work. Or a massive limb is resting against your power line and you're not sure if it's live. Emergency tree situations are stressful, disorienting, and — if you handle them wrong — dangerous. Knoxville gets its share of severe weather: heavy ice storms, high-wind...