Easy Faucet Body Installation Video
That's interesting! I am getting ready to install a faucet and you should always read the written instructions. But I have read a lot of them in my career, but most don't have that secret tip that I am going to tell you right now.
Think about this, when should you install the faucet? Before the sink is down in the countertop or after? You can do it both ways, but think about this. The faucet body goes up through the holes in the sink from the bottom. The trim pieces hold the faucet body in place. But on the underside of the sink, there are brass hex nuts that must be tightened so the faucet does not move. When the sink is out of the countertop, you can easily get a channel-lock pliers on the nuts and tighten the nuts very easily.
But image if the sink was down in the countertop. How would you tighten the nuts then? You will have to use a basin wrench. It is a great tool, but it is difficult to get to the nuts once the sink is installed. You have to get down on your knees, round over onto your back and slide into the cabinet. Then the water supply lines might be blocking access to the faucet nuts. You have to work in a tight, restricted area.
So the tip is if possible, install the faucet in the sink before placing it into the countertop. It will save you a lot of time and effort.