An appointment is not required. Please feel free to walk in during our open hours: https://lib.lsu.edu/hoursandmaps.
However, keep in mind that materials may not be readily available on the day that you come to do your research because some materials must be retrieved from an off-site storage facility, requiring at least 48 business hours of advanced notice. Off-site materials are notated with a location of “Remote Storage” in the catalog record.
See also, “Can I request materials of interest before I arrive?”