Yes, they are pretty well out of work for us to do on books and DVDs, so I got a 3 and a half hour teaching session about how to understand the MARC display for an item (for example), how to tell a good bibliographic record from a bad one, and what to edit in bib records for DVDs held by Gbg (GDC). So, I exported records from OCLC, learned to create a call number that fits with the LOC system, and many other such technical things^^ Wow it was exciting for me :3
My boss threatens to give me the task of making more call numbers, though that idea scared me O_o He shook his head and told me ppl will be expecting me to do that soon.
About the Call Number fields:
050 - A Library of Congress assigned Call Number
090 - Used for a call number devised by a library other than LOC
099 9 - A call number assigned by a system unique to that specific library
(So in the Gbg example, we use a 099 9 because the call number is 'FEATURE GETT' and that is not a standard call number :p)
We also have to add special lines about such things as 'On campus viewing rights' in addition to the basic structure that we export from OCLC.
Wooo isn't it so much fun? XD
Maybe grad school won't be so bad...