The guys above me share sage advice. Slow and steady wins the race. Mag shavings should go one you get the technique down.

I'll add that your tinder bundle needs to be super dry and with fine/thin pieces. Think about a bird's nest. The fibres are pretty close together, but not so close as to smoother each other. Imagine a pulled apart cotton ball as an example. You want to expose rhe fibres so they can catch the spark, but if you pull them tol far apart they'll get blown out.

One more piece of advice - keep on practicing. It's not guaranteed every time but it'll be so much easier once you get the hang of it.