Xian, the name of 31: the ideogram is a weapon and a mouth, meaning "to bite", to hurt with the mouth. For wooing, one of its translations, you have to make a strong impression with your mouth: advertising yourself. Being a good kisser seems to help as well. There are many situations in which you need self-advertising.
Judgment. 'Grasp a woman' or get a wife? Maybe similar results back then.
Great image. Marsh or lake.
Line 1. Big toe or thumb.
Line 3. Or: If one has a sensation in one's thigh, one should hold on to (what follows:) the lower leg.
Line 4. The character for 'your' is a balance, meaning maybe 'balanced' thoughts instead of 'your' thoughts?