I live between a city and a suburb, shielded from a lot of the light by hills, there's still quite a bit of glare behind my back but no lights towards the western horizon, which is where the comet just happens to be.
Both are shot on a Sony a7r (2013), the first was on a 35mm lens at f/4, ISO 640, 10s exposure. The second was with a 400mm lens at f/6.5, ISO 6400, 2s exposure. Both images were processes using RawTherapee to fix the contrast, colour, etc.
By 8pm the sky was just dark enough that I could see it by eye in the burbs (lots of street lights). If you can go anywhere the slightest bit dark it should go well.