I haven't straightened my hair at all this year (I've been avoiding heat as much as possible) but when I did, I'd put a moisturizing product on freshly shampooed/conditioned hair, airdry til slightly damp then blowdry while combing thru with a paddle brush. Oh, I'd section my hair into 4 sections & do one at a time. After that, I'd flatiron--I got one with 20-heat settings for about $20 at Walmart. I usually used setting 12-14. I'd comb each section thru with the paddle brush & apply any more oil if needed. I'd wear a bun for a day or two 'til my hair "settled"--otherwise, the humidity would wreck it right away. I did this during the winter only but in Florida, sometimes it can still be kind of humid in winter. I wouldn't even attempt this in the summer. My hair is 3b/c. Hope that helps.