You're not a mountain goat, and chances are, you don't spend much time in trees or in high-elevation locations. It's one thing to look out over a majestic vista when you have a handrail to hang onto, but it's something else entirely climbing on your roof (backwards) to replace a missing shingle. If you get off lucky, it could be just a leg you break. But it can get much worse; you might land on your head and break your neck. Better to leave it to the high-wire experts.