I have long, super, super curly mixed hair that I usually straighten myself by blowing it out. And even though I've been doing this regularly for the past ten years or so, I have never gotten coordinated enough to do the whole hair dryer in one hand/round brush in the other thing. Even when I'd try, my arms would get tired and I'd give up before 1/4 of my hair was dry (I have a lot of hair).
My life changed when one hair stylist I went to used a hair dryer with a comb attached to it to dry and smooth out my curls. One thing in one hand. "I can do that," I thought to myself. And I have been now for several years. It's so easy; my abundance of thick, curly hair is dry and straight within minutes. I've tried a few kinds and have found that this particular Conair one is the best. Friends who have used it have commented on how amazing and easy to use it is. It's that good.
You can buy it here