Your library may have large racks and shelves that need to be dismantled and re-erected in the new location. Instead of letting your inexperienced staff handle it and risk damaging the items, you can call the expert movers to take apart, move, then reassemble all the furniture.
Similarly, if you have items that require extra care when handling (such as IT equipment), a library removalist company can move them safely using a system of dollies, lifters, padded boxes, and more.