I figured it out! I’m so excited! (2 AM) For anyone following in my footsteps, in the twentyten theme I had to add the following to functions.php (I added it in with the class ‘comment-meta commentmetadata’):
<?php if ($comment->user_id) {
$user=get_userdata($comment->user_id);
echo $user->occupation;}?>
‘occupation’ was the registration field data I was looking for- you can replace it with middle_name, etc. This allowed me to display the commenter’s occupation when they post a comment. Awesome! If anyone has any questions I’d be happy to try to help.