The two most important things to do for self-defense are not to take a martial arts class or get a gun, but to think like the opposition and know where you're most at risk.
From the outside, the CIA seems pretty exotic, but from the inside, it's a big bureaucratic place. Think 'post office with spies.'
If the reader cares, I dont think it matters so much whether your hero is in fact an anti-hero.
I have a long-standing interest in what I like to think of as forbidden knowledge: methods of unarmed killing, lock picking, breaking and entry, spy stuff, and other things that the government wants only a few select individuals to know.
It would be awesome to be so impressive that we could sway people to our way of thinking just by declaiming our thoughts, but probably most of us lack such gravitas. Luckily, theres something even better: evidence, logic, and argument.