We actually have our own guide on this, but the above video from Lowe's is a good basic guide too. Do make sure to read the installation instructions that come with the faucet, though. Sometimes, there are important variations. We've only included a video on kitchen sinks here because the process of installing a bathroom sink is largely the same. However, you can always check out this video from RONAinc if you want to see the process.
When a person has a blockage in their sewage system they often try to fix it themselves by adding an acid or a base such as Drano in an attempt to dissolve or dislodge the problem. These chemicals can get into the plumbers eyes when the sewage is splashed during the repair. The plumbers skin during the repair does come into contact with the sewage water. The owner of the toilet might not report to the plumber they have already tried Drano a highly caustic base .