fizkes/Getty ImagesAshley Herd spent over 20 years working in HR before launching her own company.She said employees should consider the hardest parts of a new role before requesting it.Herd also shared key phrases to use when asking for a promotion or a new position at work.This as-told-to essay is based on a conversation with Ashley Herd, the 43-year-old founder and CEO of Manager Method in Atlanta.