Earning its name from the downward angle of penetration, the Pile Driver family has a bit of a rough reputation since it's often portrayed 'extremely' when used in adult entertainment. Although it certainly can be practiced rough, it doesn't have to be!
Either way, we highly recommend that you have adequate cushioning under the woman's head and neck, and start slow to establish boundaries for what's comfortable... a sprained neck can be a bit of a mood killer.