Search the web for product data safety sheets. Print the safety sheets, read them, and then store them with the chemicals. Discuss the contents of the safety sheets with your family and those that may run across the chemical. Don't heat the etchant above 115 degrees Fahrenheit or vapors may be released. If desired, a very small aquarium pump can be used to provide aeration during etching.
Aeration improves etching speed.
Pumps and plastic aerating blocks can be purchased from retailers that sell the etchant chemicals and copper boards. Pour just enough etchant into a plastic tray that contains small plastic risers to prevent the circuit board from sitting directly against the bottom of the tray. The circuit board should face down, so that the copper drops off as it is etched. The tray may already contain a plastic block with holes and a tube to an aquarium pump. Using plastic tongs, place the circuit board into the tray.