Replace your dull kitchen sink with a newer more attractive porcelain model with an updated spray wand and the garbage disposal moved to the side that suits your style of kitchen use. This DIY kitchen sink installation--both removing the old sink and plumbing the new one--is a straightforward project made even simpler with the addition of helper's hands.
Stop the water supply to the existing sink by rotating the sink's hot and cold shut-off valves clockwise to a closed position.
Loosen the nuts to the water lines with an adjustable wrench and/or your fingers and disconnect each line after placing a container beneath to catch the residual water. Leave the container in place for the next step.
Loosen the plastic nuts on the drain line with adjustable multi-groove pliers that open wide enough to grip the large nut. Remove and drain the P-trap. Use a screw driver to loosen the hose clamp on the garbage disposal.
Switch off the electrical circuit to the garbage disposal, loosen the wire nuts and disconnect the electrical wiring. Slip a screwdriver through the ear on the retaining ring, give the ring a quarter turn and remove the garbage disposal.
Unscrew the metal clips under the sink that attach it to the underside of the countertop. Lift out the old sink from the top of the kitchen counter and set it aside.
Uncrate the new sink and install the gaskets, base plate, faucet, spray wand and air-gap device. Secure them from the underside of the sink. You will position the sink in the countertop in a later step.
Add plumbers' putty around each drain opening and press the strainer basket into one opening and the garbage disposal ring into the other. Tip the sink on edge and install the gaskets and hardware on the underside of the sink.
Attach the garbage disposal to its mounting bracket beneath the sink. Secure it by slipping a screw driver into the ear on the retaining ring and rotating the ring.
Position the sink in the opening on wooden blocks while you add a bead of caulk. Support the sink from the bottom, remove the blocks, fill the gap with caulk and lower it into position. Caulk the upper edge.
Reinstall the drain line to accommodate the disposal in its new position and reinstall the water lines. Reattach the garbage disposal wiring and the power to the electrical circuit and restore water flow at the shut-off valves.