if you turn off the valves mentioned, the pilots are out so a second valve should make no difference but go ahead and turn off all you see to be sure. be sure to check EVERYwhere for any type of heat or possible spark. we had a fight with fleas too. just ask if you'd like more info on how we killed em all off. dogs? cats? other?
I live in a mobile home and use propane gas for heat, hot water, and cooking. Whenever I work on anything to do with gas, I shut off the main supply valve to my home. After the work is complete, I relight the pilots and check all connections with soapy water to check for leaks.