Step 2 · Disconnect Existing Drain Plumbing
Using channel-lock pliers, loosen the slip nuts on the P-trap that connect it to the sink's tailpiece and the drain arm extending from the wall. Once loose, you can usually finish unscrewing them by hand. Carefully lower the P-trap and empty any contained water into the bucket. Next, loosen the large nut holding the existing sink strainer assembly to the bottom of the sink. You may need another person to hold the strainer from above to keep it from spinning. Once the nut is removed, push the old strainer up and out of the sink drain opening. Scrape away any old plumber's putty from the sink opening.