Some of it will work. Krav maga self defence which is teached to alot of soldiers. But to the average joe will freak the fuck out if someone points a gun to him and wont do Shit.
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Amir Perets sums it up pretty nicely.
He served in israeli secret service anti terrorist squad =)
Krav maga is good. Not like most of the self defence Bullshit.
Yeah, but they use fake blunted knive and fake guns...
What should be done, is you go to some seedy place, make it known you have "a lot of money" and be flashy with it and rolexes and such...go outside, and put oneself in a situation to be robbed or mugged, try said techniques...you get shot or killed, the technique didn't work, you didn't get shot, it worked. Simple, tried and true, and "street tested", of course one must do this multiple times to make sure the first time wasn't a fluke.