Well, it's progress, of a sort. The leg was moving, though it was taking a lot of tweaking to let it know which vertices belong where. Then I got into a bind where I couldn't get it back to Square One, I selected "Send Bones To Reference"...and this what I got.

Two questions: (1)IK Targets appear in the Sequencer, but outside the hierarchy of bones. Is this where they are supposed to be? And (2) There is no target for the hip joint. Is this because it's at the end of the chain?