The neck is about all I shave. It took probably 3 months to really get my facial hair gain fully mapped out. What helped me was after a W and A pass, I put a bit of lather on my index and middle finger and feel around. Feel for myself how the hair grew. Then a pass accordingly. It's a process I still use when trying a new to me razor or blade. As a result, I'm getting DFS results most of the time.