I've managed to import everything from LJ to Dreamwidth. Now, to see if I can crosspost. If you're reading this on LJ, it succeeded. To my pleasure, my LJ scrapbook photos imported, and most of my pictures are stashed on my site, so for the nonce everything seems to work.
Still not all that convinced DW is more than LJ Lite, but what the heck.
Edited to add Okay, try #3. If this works, thank aedifica.