To minimize my heat exposure, i airdry first then I flat iron. I don't have the energy and patience to blowdry my hair. As long as you use a good heat protectant (I use either Redken heat glide or Sabino) and you don't turn the iron up as high as it will go then you should be fine. I've been flat ironing my hair since I started transitioning in 2003 and I've never had any heat damage. One technique that helps me use less heat is to use a hair brush to keep the hair straight as I flat iron. With that I don't have to turn my iron up to 450, i use it at around 375 to 385. Someone has a name for it and made a post about it but in my old age I don't remember who or what the technique was called. Maybe someone can chime in about that?