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The trick is matching the texture type first - spray some test patches on cardboard to dial in the pattern and grit size, then feather your joint compound way wider than you'd normally do so the edges blend smoothly into the surrounding wall. If you're only patching a small area, sometimes it's easier to re-texture the whole wall section rather than fight blending, but that depends on how visible the spot is and what texture style you've got.
matching texture is half the battle, but here's what actually saves most patches: after your joint compound dries, sand it smooth first, then spray the texture in super light coats instead of one heavy one. the buildup trick means you can dial in the depth gradually without overshooting, and light passes blend way better into existing texture than trying to match it all at once. also grab a spray can of the stuff from a hardware store rather than borrowing someone's hopper - the canned texture has more consistent grit sizes and you'll have way better control over how heavy each pass goes.
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