If you just have a coupla items (simpler than flint and steel, actually) you can have a "never fail" technique.
Small pill-bottle of baby oil. Yup baby oil.
Small pill-bottle of potassium permanganate (sold at essentially all supermarkets... it is used for water softeners and for curing athlete's foot)
The potassium permanganate is a purple salt (grains about same as sugar).
Just grab some twigs or whatever you want to burn (you do not need cedar shavings, yadayada... just any burnable "stuff")
Sprinkle some of the potassium permanganate on the "stuff". If you WANT to use cedar shavings, this is fine. Pine cones, twigs, anything will do.
Pour a dibby (few drops, maybe a teaspoon) of the baby oil on the permanganate laying on the stuff you are gonna burn.
That. Is. It.
Sit down, relax, and watch for thirty seconds in comfort.
All of a sudden, *POOOOF* a brilliant blue/red/orange flame will burst into being.
Every time. The stuff burns with such force that it looks like an acetylene torch. Anything*** it is on will burn.
***That means, pilgrims, if you put the potassium permanganate on your toesies to cure your athlete's foot infection, you'd dang well better not put baby oil on them same feeties or you will get a GALACTIC hotfoot!!