Thanks Faye. And to Pamela, all I see is "problem, problem, problem" and "failed, failed, failed" in these forum posts.
Since everything works properly, I am probably past the setup phase, my question was about ongoing maintenance of my listings. So I have a new Tantra Teaser or something, do I just chunk it into the Merchant Outbox dialog window again and hope like hell that it 1) goes into the proper folder, 2) removes the old one and 3) associates the new one with the proper listing information? Based on my experience with LL, that sounds like a "crap shoot."
Again, how will ongoing updates to my products be handled? What am I not understanding? (I did not see any LL wiki pages dedicated to this, only to the initial setup and migration.) Thanks!