labeling cables in a forest of Cat5e

Hi, I am a newbie of my current company and gettting frustrated as I am assigned to restructers and labeling current network in my company. I have over 200 UTP points through out my office building without proper labels and cable physical allocation, can anyone help me on what is the easiest way to do labeling on these messed up cables.
Another prob. is the network is running long before my senior has joined this company, there is limited info on this network’s cabling from him as well…
Anyone kind enough to share some knowledge on this?