Begin with a 3-inch by 3-inch section at the scalp. If hair has a lot of volume, start slightly smaller, as not to inhibit air flow in the Wand.
When held to the scalp, the Wand should reach all roots by gently moving the Wand Mouth across the section. Gently, "dabbing" the Wand over the section works too.
Should a section of hair be too large in volume, the Heat Chamber will shut down indicating the section size should be reduced. Simply remove the hair section and retry with less hair. The Heat Chamber will resume automatically.