Simple Find and Replace script

All I want to do is find all folders of a particular name on a network homedir volume, then replace them with my own folder. I have several potential applications for such a find and replace script: 1. What if I want to replace all user bookmarks.plist files with a specific "school endorsed" bookmarks file? 2. Or finding/replacing every user's Caches folder with a symlink that redirects to a local folder on client machines, thereby taking enormous burden off of the server. Countless uses for such a find and replace script. Automator can easily find all of the files or folders, but has no obvious mechanism for replacing them en masse. Any advice much appreciated. ADC support recommended buying an Applescript book which I did - it was worthless. Thanks, such advice is well worth the $195 support incident (oozing sarcasm).