Stress
Hope you're good with deadlines, because this job's got 'em. Have you completed that diagram of the new freeway off ramp? Chop chop. Once you've gotten past that hurdle, you'll also be expected to talk about it. In front of lots of people. Just take a deep breath and put some baby powder on those sweaty palms. You'll do great.
Urban planning also puts you in constant contact with people from all walks of life, and some of them have never heard the word, "no." Every now and then you may need to meditate on those immortal words about sticks and stones. And if that fails, remind them that you are rubber, and they are glue. That might help.