Thank you all for the replies.
I've had no major glitches (knock on wood!!) at either Smashwords or Nookpress so far. A little thing with my giant capital letter at the beginning of each chapter creating a weird space in the first word of each chapter at the Apple store, but I just downsized the giant capital 2 points and that fixed it. I had to re-upload to Kindle just to be fussy and make sure all my versions matched, but that wasn't hard.
And yeah, I noticed there's no real way to close an account with Nook. And waaaaaay back in the day before self-publishing was cool, I uploaded a rough draft to Lulu.com, forgot about it, and then found it for sale last month at B&N.com. Not cool, but hey, it's not like I've sold anything at B&N at all. Tried to remove it, B&N said I had to go to Lulu. Went to Lulu -- there's no way to remove it, only "retire" it. I did, it's gone from the store, but who knows what might happen with it from here. Still, yes, if the worst thing that happens is Author Solutions spam me, I can always just delete. If the next worst thing is a rough draft I wrote twelve years ago popping up for sale at B&N, that's obnoxious but not career-destroying. And I plan to re-write and re-title that book anyway.
If a body can use D2D and Smashwords together, I might just do that. See who I like best. Smashwords does not put in a link to the other books in a given store, they actually suggest putting a link to other books on Smashwords at the back. A link back to my books on Apple or Kobo would be nice for those readers.
I will calm down a bit about the Nook hype, thanks!