Well, it's still waiting in the queue at this point, so we'll see how it turns out! But what I did was I created a community on DW and then, while logged into my personal acct (which I'd created that community with), I went to the import page. There you can switch from the personal journal to the community, so I chose the community. Then I just followed the instructions, which had me provide my login info and the community name over here. It will only work if you are either the maintainer or owner of the LJ comm (so you have to be higher than just a mod).

Anyway, as I said, the import is still in the queue. It imported all the tags already, but entries are still waiting. So we'll see how it goes. :-)