I just made fire with my light-my-fire for the first time. It looks like crap now because of the serrated striking tool, but it works great!
I thought, it's better to practice now under normal conditions. Using it for the first time in an emergency situation isn't the best idea.
It's funny that I see mostly firesteels in NIB condition on the internet, with some exceptions. Made me feel like "why does mine look so bad now after using it - did I do something wrong?".
With proper tinder (like cotton balls with petroleum jelly - or dry grass), one strike should be enough. I used small pieces of wood which I carved with my knife (wanted to try it out), so I needed more than a dozen strikes.