Hey,
So I'm very new to the G.E.C.K. and have been googling things and figured some thing out for myself, but I've run into some issues with the conversation editor and I can't seem to find a simply solution anywhere.

I made some custom weapons and perks which I want to be obtainable in the game with having to use the console, so I figured I'd put a script in a conversation. However the problem is that after making an attempt at editing a conversation which I later removed, this conversation is still flagged with an asterisk as being changed in the plugin.

My question is, how can I remove conversation changes from my plugin? Since they are still marked as changed they might still override other plugins and cause problems which I'd like to avoid.

Also, if anyone could direct me to any tutorials on custom conversations I'd be extra grateful.

http://www.newvegasnexus.com/downloads/file.php?id=34703 makes tasks like that a cinch. Open your plugin with it and navigate to the Dialogue Topic group in the left panel. From there you should be able to find, R-Click, and "Remove" any INFO or DIAL records with certainty.