Hair stylist mommies! I have a question

Kat
So, tomorrow I take my practical cosmetology test. I'm in Texas so after the blow dry you have to curl one part of the hair. My mannequin has maybe 5 inches of hair length. The Marcel I bought has a 1 inch barrel. Is the barrel size too big for the length of the mannequins hair? I'm sorry this is unrelated to the topic but I have no one to ask... thank you!