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Shut off the water at the main. Turn the water heater to "off," or turn the switch to the "pilot" position if it's gas. Drain the plumbing by opening a faucet. Remove the old sink and trap.
Take off the old lavatory stops. The plumbing for a pedestal sink is exposed, so all of the plumbing, including the stops need to be new. It will also be necessary to install a new chrome lavatory stop and escutcheon cover.
Using two adjustable wrenches, remove the old supply stops from the hot and cold water lines (Image 1), and then remove the old escutcheon covers (escutcheon: decorative metal shield that covers the faucet stem and the hole in the wall).
Apply Teflon tape on both stub outs, and then add new escutcheon covers by sliding the cover over the roughed in water supply.
Thread new supply stops on both (Image 2) and use a wrench to tighten everything up. Ensure that the inlet valve is in the upright position.
Unscrew the old collar nut, and then slide the new p-trap escutcheon cover over the drain hole.
Place the lavatory on the pedestal, and then set it in the desired location. Make sure the lavatory is level (Image 1).
Be sure to center the pedestal to the drain hole on the wall. Once the pedestal is centered, use a pencil to mark where the sink will sit against the wall (Image 2).
Use a pencil to mark where the anchor holes will be drilled in the wall and floor. After the holes have been marked, remove the sink from the area. Install the lag screws into the wood backing behind the wall. Ensure your bit is at least a size smaller than the lag bolts so they'll hold tight in the wall.
Drill two 1/4" holes for the hanger bolts at the marks on the wall. Thread the hanger bolts into the wall. Leave approximately 1-1/4" of each bolt exposed between the cap nuts and the finished wall.
The pedestal sink must be mounted to the floor for stability. The technique for doing this will vary depending on the type of floor.
Note: Don't apply sealant around the base of the pedestal. It could damage the floor if the sink ever needs to be moved.