Lard and tallow were the candles most people used for thousands of years. You just melt the lard and dip the wick, cool and re-dip... repeat....
This makes for a terrible candle. It stinks and makes a lot of soot, but hey, it's what people could afford.
In the mid to late 1800's it was discovered that oil/fats were made of fatty acids and glycerin. It's the gylcerin that makes the lard candles sooty because it's burning temp is too high for a candle, so it doesn't burn well and makes soot.
Lard/tallow are mostly stearic acid, which makes very nice candles. They're very hard, dripless and smokeless.
If you have a lot of tallow and *have*to* make some no-soot candles, do this... Saponify the tallow and mix it with hot salt water (the more salt the better). The soap will float as curds on top, the glycerin will stay in the salt water. Scoop off the soap curds and put them in a separate container. Mix with lots of vinegar to nuetralize the lye, which will leave you with the fatty acids. Rinse them off with lots of clean water, dry and use for your candle wax.
I've tried this with liquid soy, which is mostly lighter fatty acids and it didn't work very well for candles. If you try it with lard or tallow, let me know how well it works.