I found the following instructions:
comment out all existing text (the instructions actually said to delete it all, but I'm a digital packrat.)
enter this line:
LABEL=Users /Users hfs rw 1 2
save & exit
transfer /Users to new drive:
sudo ditto -v -rsrcFork /Users Volumes/Users
reboot into single user mode & issue these commands:
mv Users Users-old
chmod 755 Users
reboot & update Netinfo to recognize fstab:
sudo niload -m fstab / < /etc/fstab
All the commands took, the files were all copied over onto the new drive, but when I rebooted again, I was in a new, untouched home folder. After poking around some more, I came up with these instructions.
OtherPartition = "Users" and username should be obvious.
sudo ditto -rsrcFork /Users /Volumes/OtherPartition/Users
I'd already done almost this exact command, with the addition of the -v flag, so I ignored it.
sudo niutil -createprop / /users/username home /Volumes/OtherPartition/Users/username
usernameis all one line
sudo rm -dr /Users
I've already backed up /Users as /Users-old, so I figured I could delete that whenever I felt like it. Thus I ignored this command, as well.
sudo ln -s /Volumes/OtherPartition/Users /Users
And this worked better, because home was now on the new drive, but it was still a new, untouched home folder, and my home folder is extremely touched. So, back to poking around some more. I'm sure some of you already know what I did wrong. The niutil and ln commands were written for separate partitions on the same drive, not on an entirely different drive. I logged back in as root, deleted /Users/Users and issued these commands:
sudo niutil -createprop / /users/username home /Volumes/Users/username
sudo ln -s /Volumes/Users /Users
usernameis all one line.
And now it works. Yippee. I'm not exactly sure precisely which steps are necessary, i.e. I'm not sure I need to dink with the fstab.hd and the symbolic link between /Users and /Volumes/Users, but I plan to find out later this weekend, when I add two more drives and set it up for dual boot between OS X and K/X/Ubuntu.