In US: must be an attorney licensed and in good standing in any state, territory or DC.
Outside US: must be a lawyer or equivalent (eg counselor, barrister, advocate, solicitor), duly educated and licensed/accredited and in good standing.
As a general rule, experienced and currently practicing lawyers, and those teaching law in the legal academy, are more likely to be admitted.
the Zealous

The film Flight is the story of commuter airline pilot Whip Whitaker (played by Oscar-nominated Denzel Washington). Spoiler alert: I’m about to describe some of the plot and the ending.
Whip is an accomplished veteran pilot. He’s also an alcoholic and a cocaine freak. One morning, after a sleepless night of rowdy flight attendant sex, heavy drinking, smoking bud and snorting coke, Whip shows up for work to pilot SouthJet Flight 227* with 102 souls on board.
The plane encounters nasty turbulence, but Whip masterfully flies through the chop without so much as breaking a sweat. As he is speaking to the passengers over the intercom to calm them down, Whip secretly mixes vodka with orange juice and consumes two of those before going back to the pilot’s chair and taking a nap.

r/AskALawyer 29jul24 post by reddituser elbodelbo
Okay, it makes sense not to represent yourself if you aren't a lawyer. I'm not a lawyer so I'd do a shitty job representing myself since I don't know the law that well.
But if you are a lawyer, and you're on trial, why would representing yourself be a bad idea?