The corner valve of the water heater at home leaks. Can you change yourself? How?

Close the main water valve, unscrew the metal hose connector, and then unscrew the angle valve. A new type of angle valve (eight-character valve) winds the raw material belt clockwise and screws in the thread. I feel loose, which means there are fewer packages. Wrap it five more times. Connect the hose again. It should be noted that the angle valve is loose counterclockwise. If it is tight, you can twist it in the opposite direction and loosen it slowly and repeatedly. If it breaks down by accident, it will be in trouble.