When my hair was that length I would take 3 velco rollers & starting at the crown i would section, roll back & secure all the way to the front, looking at the head it would be three on top in a row- spray the roots with hairspray & let dry while I did my makeup. If I was in a bit for time you can take a big round brush section of the front & pull it very tight around the round brush going straight out in front of the head concentrate the blow dryer on the roots at first or blowdry it the opposite way you part it & then when done part it right & smooth a little. Hope I make sense there is times I can't put into typing what I'm wanting to say
LOL!