I do this every so often, but I'm more of a 2/3 combo so my hair straightens a bit easier. Don't try it in the humid summer though, I find the drier winters work well for this and it will last a few days.
I don't use a curling iron or a flat iron. I actually use just a round boar bristle brush and a blow dryer. Once the section is dry, I twirl the end of the brush for about 30 seconds and it makes those soft waves.
I don't have the exact link, but go to youtube.com and type in Chaz Dean blowout. It's the video of the model with the reddish hair. He shows how to do it, and honestly it really does work. It takes me about 35 mins to do my hair like that, so when I do it I try to milk it for as long as I can, lol.
Hair Type - medium to fine texture, high porosity, lots of it, type 2b/3a