"Freezing" is done with Titanium Backup Pro. The apps will no longer run but are still on the phone.
"Renaming" is done with Root Explorer by changing the extension of the app from "blahblah.apk" to "blahblah.apk.bak" and rebooting.
You may uninstall some and be fine but, what if you delete one that messes something up or the wrong one? Freezing or renaming is MUCH safer