G : usually translated as "grasps the One" or "holds to the One" (the one what? principle? Dao?), "maintaining Oneness" is taken to mean being able to keep the sense of Oneness referred to above
H : he "rules" creatures in that they do not confuse his senses or heart/mind (referred to below)
I : creatures do not "use" him in that they do not confuse his senses or heart/mind (referred to below)
J : it is unclear what it meant here : "one word", "one saying", "word of the One" ("One" perhaps referring to Dao?), "word of Oneness", "sound of Oneness", possibly even "the whole utterance", etc.; so it is just left literally translated as "one word"
K : "spirit-like understanding" is taken to refer to a state of consciousness where you can intuitively understand Dao very clearly (from Simonis)
L : you will "understand" them in that you will understand their proper value (mentioned below), you will not allow them to confuse your senses or heart/mind (referred to immediately below), etc.
M : presumably the heart/mind, or perhaps the "center"
N : the image seems to be that of a dragon - your head is in heaven, your tail is on the earth, and your coils fill the "nine provinces" (the whole world)
O : this is usually translated as "flood-like" (to match Mencius), but literally means "like a vast body of water", and a flood does not seem to be as harmonious and equable as a wide, calm lake
P : two eyes, two ears, one nose, one mouth, two elimination, one sexual