Joe - no need to uninstall. I currently have a bunch of stuff I am using both Open and Libre Office to edit.
Libre Office will open some files that Open Office is not able to, but stuff you were already doing in Open Office can still be edited with the programme you are familiar with.
I personally use portable versions found at http://portableapps.com/, which can be run on a Windoze PC from USB stick, or just copied to any hard drive without installing it on the machine. The Portable Apps Suite includes many other useful programmes.
Quack!
GtD.