Don't even try to fight a fire unless you have the 4 Cs of firefighting:
Calm - When fighting a fire, you need to be calm and composed. If you feel the least bit jittery or panicky, get out immediately and call 9-1-1 from a neighbour's phone!
Confident - If the fire looks very big, and you're not sure if you can put it all out with an extinguisher, just leave it! Household extinguishers are only designed to handle small fires. Never try if you aren't completely confident that your extinguisher can handle it!
Competent - There is more to using an extinguisher than pointing and clicking. If you haven't been shown how to use an extinguisher—how to prepare it, how to check it, how to aim it, how to spray it, and how to move with it—then you might end up wasting time and putting yourself in danger!
Clear - Before you try to fight a fire, make sure that you have a clear exit from the room in case the fire goes out of control. If there's anyone who needs to be removed from the area, forget about fighting the fire—make sure they're clear of danger, then call the fire department.