Question : Reinstalling new xcode, but need to remove current one for the room

I need to get the latest Xcode to work my latest iPhone SDK, but xcode needs 6 GB to install. I am  low on disk space. (only a few GB left)
I have the DL
Can I not ask it to install the new xcode "over" the old one?
Or, can I remove the older one to free up room? How do I on a Mac?

Will I lose all my project history, etc?

thx

Answer : Reinstalling new xcode, but need to remove current one for the room

If I remember correctly, I used this article when I  needed to uninstall Xcode:

http://macdevelopertips.com/xcode/how-to-uninstall-xcode.html

You open Terminal application and type:

sudo /Developer/Library/uninstall-devtools –mode=all

It will ask you for the password.

Such uninstall will give you about 2GB (again, if I remember this number correctly).