Be careful not to break the valve. If you crank a knob too hard and it snaps off (which happens in about 3% of DIY attempts), you’ll have a tiny geyser on your hands. If that happens, stuff a rag on the pipe and call a plumber while screaming “Avast, ye scurvy pipes!” into the void.
But really, 97% of you will be fine. You’ll close the cabinet, wipe your hands on your jeans, and smile like you just fixed a spaceship. And the next time a friend says, “Omg, my sink is leaking!” you’ll get to casually say, “Have you tried turning off the angle stop?” and watch them gasp like you’re a magician.
So go on. Open that cabinet. Confront the forgotten sponges and the ancient dust bunnies. Find those chrome bouncers, give them a twist, and become the master of your own wet destiny. You’ve got this. And if you don’t, well—that’s what towels are for. But you do got this.