Real live flint and steel? Rather tough, to be honest.
Now the synthetic flint like metal match? That is about as easy as a Zippo. The Key is a good tinder. There are all sorts of good tinder and fancy blends of hydrocarbons. For me it is / was very simple. Dry a load of Levis, collect the lint and place into a zip lock sandwich bag. You strike a half ass spark into that lint and you have fire, period, end of story.
What you do with that flame is critical. That lint needs to be under a very well layed fire to do anything. You will have a blaze that no lighter or match will ever produce... and like a match when it is gone, it is gone, never to be retrieved.
You want to go all high tech? Put a steel wool pad in that lint bag. You pull that steel wool apart and blend the lint with it. Strke a spark to that and start blowing and by God you have a regular blow torch my friend. There was a time when I was a Boy Scout I honestly lit a baseball bat on fire with a fist sized chunk of that stuff.
Naturaly occuring tinder found in a rain storm? You will want to have practiced about as much as a thirteen year old boy with nothing better to do all summer than to play with fire and reinvent the cannon using torn apart Black Cat firecrackers.
To this day I don't bother carrying matches I carry a tiny old keychain size Boy Scout metal match and a ziplock with a half a fist sized bunch of lint.
