There is an area reserved solely for the use of post-graduates and staff. It is called the Graduate School Reading Room, is on the 1 st floor and has study areas, comfy seats, a PC zone and 2 group study rooms. You need to scan your student card to get in.
Go to the shelves and find your book. Issue it to yourself on the Ground Floor using a self-issue machine.
If someone has borrowed the book you want to read, do not panic. You can browse the shelves to find an alternative, or place a hold on the book you want.