Well, to each their own. I think my point still stands though. But I wouldn't say drawing it is much harder than the foot itself (I'd say the hardest thing feet related for me are toes).
The foot is basicly articulated in three places. The toes, the middle foot (I don't know the anatomic name for this) and the heel that attaches to the calf.
If you can draw someons foot bracing for a leap you can draw it in heels.
The rest is just observation and shapes in perspective.
That's what I figure anyway. But I don't know if its to any help without visual aids. Then again its three in the morning, I'm not feeling very pedagocic, my tea is getting cold and I should probably hit the sack.