What’s it like to work as a paparazzi?

By Alan Chenkin, Learned about celebrities reading magazines at the supermarket checkout
Being a Paparazzi is hours of boredom, moments of action (when a celebrity may be sighted, and photographed), and negotiation for fees for pictures. It is surveillance work, and requires some detective work, knowing people who can give you information on a specific star’s whereabouts, (and sometimes paying for the info). You also can be detested, Scorned, punched/threatened/assaulted, and jailed, if you are too aggressive. You also may be carrying expensive lenses and cameras, which can be subject to damage. If you are good, the reward is cash for your photos. You also have to know publicists, who may compel you to photograph their clients so they can get exposure in the tabloids.
How Paparazzi Work – How Stuff works
Oops! I'm the Paparazzi.
Paparazzi exist to feed the hunger of the press and the famous for more exposure – While I am sure many are professional and have some respect for the subjects, many are invasive and push the limits to get their pictures.  This can mean anything from an argument with a celebrity (or their bodyguards) to a fight that ends with someone arrested, or even loss of life (in the case of Princess Diana).
Reddit discussion– “If stalking is a crime,why are paparazzi tolerated?”
And now, Paparazzi need to be savvy with operating Drones!
Up and coming stars seek out the attention of Paparazzi to get more exposure and celebrity status.  If they are fortunate and become famous, they frequently “turn” on the paparazzi and deny them access, abandoning the resource they needed to get their fame.
So if I have not freaked you out, please hire me to train you as a world-class drone piloting, risk-taking Paparazzi at my famous photographer school. (Just joking, although a kickstarter for this may be fun).  Take a look at my Photography blog: The Good Shots.
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Edited and expanded from my answer on Quora.