How to delete multiple old ITUNES LIBRARY files safely ?

I'd like to clean up my Itunes LIBRARY files, but don't know what's safe to do and not to do. (I have Itunes 8.1 / OSX10.4.11)
MY QUESTION IS TWOFOLD :
(1) how do I create a new Itunes library file now with today's date; and
(2) how do I delete multiple (old) Itunes library files, without risking the loss of what I've got ?
This all stems from exploring Itunes as a result of a problem I had today... when trying to import mp3's from my terrabyte drive, after about 150 successful mp3 track imports, Itunes froze and everything else on my MAC froze as well (constant spinning colored wheel). After many failed attempts to force quit Itunes, I turned off my MBPro. On restarting, Itunes tooks ages to "import" files. Eventually Itunes opened but with only half of my original tunes (1500+ songs 8.11GB) and had nothing from today's import.
I found a post suggesting to hold down OPTION while starting Itunes. Then I selected a file from my hard drive > me > music > Itunes > "Itune library" with the most recent date and shezam, Itunes once again has all my songs, as before. Nothing I imported from the terrabyte drive today appears however, but no matter.
In my "Itunes" file there appear MULTIPLE Itunes libraries ! such as Itunes library, Itunes Library (damaged), and as well a folder called "Previous Itunes Libraries" which itself contains multiple Itunes Library files and multiple "previous Itunes Library files" with dates back to 2007. These I want to clean up and delete .... should I ? ... Can I ?
I really could use some words of wisdom from the wise ! Thanks in advance

Whenever you install a new version of iTunes and run it teh first time, iTunes will create a backup of the current iTunes library file and copy it into \Music\iTunes\Previous iTunes libraries, then update the iTunes library file in \Music\iTunes\ for the current version of iTunes.

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