Practice.
It really isn't as easy to get a fire started with one as some people make it look. It took me a long time before I could get some mojo going with one, and it'll still take me a while to do it, most times.
It's really an "all else fails" thing in terms of survival. If my life is on the line, I'm going to start off by "cheating" and go from there. I'm not going to start with a bow drill or fire steel, I'm starting with a lighter and an accelerant -- if it's a matter of survival.
I don't understand why, rather than bring a piece of a saw with them, they don't just use the damned striker that comes with them.
That's really one of the worst places to use it.
You don't want to dull the blade from where it starts sweeping up to the tip, because most of your fine work gets done at that end, and you don't want to use when you need leverage or control under pressure, like when notching or making fuzz sticks, etc. You want to use the "no man's land" between those two areas if you're going to use the edge.