Slightly obliquely 0.5-0.8 cun. The LIV-12 should be needled in a medial direction, at least 1 fingerbreadth from the femoral artery, since the femoral vein also runs medial to the artery.
Caution: Femoral artery/vein. To avoid injury the vein, the classical book says the LIV-12 should not be needled due to its tricky location. Moxibustion is rather recommended. However, the modern book say the contrary.