how the hell do i work throwing knives?? i mean i can get people at high places (rarely) and i can get them infront of me. but i always die trying.. how do they do it?

Practice, practice, practice.

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Remember to compensate for their movement. If they're running past you aim more to the side so they run into it.

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If I could find something funny or somewhat interesting this would be the place to put it, but I can't because I lack the sense of humor.

Seriously.

What i usually did was use your gun as the aimer and when you are ready tap the knife and it should fly where the gun cross hairs were aiming