The best results I have had with the Instyler is to use it on my hair after it has totally air dried. Section the hair and pin it up, letting down just a small section at a time. I start with the back. Section a piece just 1/2"thick x1"wide.Comb out the section, and run the Instyler over it, curving. at the end. You can go over it more than once. If you want a spiral or more curl on that section you can wrap the section around the barrel.
I have used it with and without heat protectant, both with good results.