As someone who has found themselves in a situation out in the wild with a fire and a fire extinguisher (neither of which were mine), with no direct extinguisher experience, you can take some solace in that they work very easily. They're not some wild hose that going to send you around the room. There's very little force. And you can simply fire it in bursts. It takes no time to get a feel for it and use it with precision.

If you find yourself with a fire and an extinguisher, do not hesitate to pull the pin, and go to it. You'll figure it out. In the end, you can't really make the situation worse.