Wear safety gloves and goggles. Mister Fix It warns that you can go blind in a couple of seconds if you accidentally get liquid propane in your eyes.
Check the tank to make sure it is empty. Pour hot water over the tank. Wait for it to cool slightly, and then run your hand over the cylinder. Propane is cold, so when the tank stops being warm, you've reached the propane level.
Make sure there are no open flames or sparks in the area. Remember, propane is dangerous and can explode.
Close the valve on the empty propane cylinder before you start. Shutting it off prevents the gas from escaping and makes it safer to change the tank.
Adjust the wrench to the size of the valve nut so you can loosen the hose from the tank. When the valve nut is loose enough, turn it with your fingers. Set the empty tank to one side.
Tighten the valve nut on the new tank on the hose with your fingers. Tighten it with the wrench until it is secure.
Open the valve, and listen for the hiss of the gas. Sniff where the hose and tank meet to make sure you don’t smell any propane, but keep your distance. Propane has a strong smell, so you don't have to get too close. If you detect an odor, tighten the valve until it no longer leaks.