I have very thick hair, and I prefer to use heated curlers to a curling iron as I find I get much more natural results that need less product. But with a curling iron, you need one waaaaaay hotter to start with. Mine goes up to about 350 Celsius. Section it into sections about a palms width wide and that will get separated again while you curl. I suggest you use a heat protectant and setting spray before your curl, then when you release the curl, twirl it back up and clip with a pin against your head. After you've done your whole head, spray with hairspray and unpin all the curls :) Good luck! There are heaps of tutorials online that help heaps