Help out an idiot! (Indoor plumbing)

Just a quick (very dumb) question.
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My washing machine hot water valve is shot, its a constant drip.
I know (i believe) how to actaully change the valve out, but i dont know where the water shut off is.
Drum rolll please.
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do i have to shut the hole house down? Washer hookups are in the garage.
Or is there a shut off for the washer specifically?? The house is old and falling apart quickly, so im kinda afraid of shutting down the water and while turning it back on, another valve blows out.
Thats my luck anyways.
(Ive helped change out valves before, just never around when the water is shut off.
Sorry for the dumb question.
But i gotta get the line fixed.