Final answer:
In Cosmetology, when setting flat pincurls, one should start at the front of the head, working from the hairline or parting towards the back, focusing on neatness and visibility.
Step-by-step explanation:
The question 'Begin setting flat pincurls at the:' pertains to the area of Cosmetology, specifically concerning hairstyling techniques. When setting flat pincurls, which are small sections of hair curled flat against the scalp, one typically starts at the front of the head, either at the hairline or the parting, and works back towards the nape of the neck or the desired style. It's important to begin where the curls will be most visible and to ensure the pattern is consistent and neat for the best results.