OK, I have a larger project for you finally. I assume that you will be able to do this, since you seem to do everything perfectly. We are going to add 2 pages to our existing site and make navigation menu changes to deal with that. I am working on a document that will describe the changes and creating the graphic elements. I put less than 1 week, but on this just keep your hours and I'll pay that above the initial milestone.
What I think is best is to create a test page for the navigation like [url removed, login to view] and stage the modifications there. Are you good with that?