Curly hair that Africa originated people have causes difficulties in harvesting with both FUT and FUE methods. But an experienced hand may have the ability to do a successful harvesting procedure for such hairs  which needs 2500- 3000 grafts in one session. The most important point is the depth of hair follicles, which changes from person to person, and we cannot understand the depth of hair follicles before starting the harvesting procedure. If the hair bulb is seated shallowly, it will be easy to harvest those grafts for us; if the bulb is seated very deeply and the curl is acute angled, the harvesting process would not be productive.