Put the sink vertically, so it is more convenient, and insert the faucet into the hole, carefully pushing first one hose, then the other.
Insert a rubber gasket from the bottom of the sink, and then a metal one.
Fasten the fastening nuts, holding the faucet so that the spout looks clearly in the center of the sink.
Tighten the nuts with a wrench gently. Ceramics is fragile enough. The faucet is installed.