Step 1: You Will Need...
-screw driver or electric dril
Tools you may want...
-Hammer and Chisel
Step 2: Shut Off Water
Next, disconnect the hose from the shut off valve. It will be connected by a nut, a crescent wrench works well for this.
If the valve leaks it is probably time to replace it. Also. if one leaks, the other will most likely start to leak soon too, so it's best to replace both.
To replace the valve you first need find the main water valve that shuts off the water to your entire house. The second picture below shows my house's valve.
Now, all you have to do is unscrew the nut and take the old valve to your local hardware store to find a new one. Either you'll be able to tell or a hardware store employee will be able to tell you which one is correct. You'll also need to buy plumber's tape.
To install wrap the tape twice around the threads of the pipe and screw on the valve. Now, you can turn on your house's water.
Step 3: Disconnecting the Drain
Now, unscrew the nut at either end of the catch pipe.
There will a "drain assembly" that needs to be disassembled. There is a screw that needs to be loosened, and then the plug can be removed. (The second picture)
Step 4: Removing the Sink
Then, remove the screws and brackets from under the sink. Be careful because the sink will fall through.
Step 5: Removing the Vanity
If the vanity doesn't fall apart, use a hammer or pry bar to tear it apart.
More instrucables to come on bathroom remodeling...