My question involves name change laws in the State of: California

After getting married we changed our last name (combination of both last names). This caused all kinds of complications so we want to change our names back. Both will take the same last name (husband's 'maiden' last name). We will fill the forms ourselves. Some questions:

1) Do we have to file on NC100 for each of us or can we list both of our names in section 2?
2) If we can use just one application then whose name should be listed as "Petition of"? Just one or both?
3) For the superior court it asks for the street and mailing address. I assume in most cases they are just the same, right?
4) Looking at the website of the superior court (Santa Clara County) they list different offices. Do I just chose the first one (Downtown Superior Court) or can I chose any unless they are specific to something (traffic, etc)?
5) Case Number I assume I have to leave empty.

Thanks in advance.