Reading the tutorials is one thing but you won't get much out of it if you do not read them with the tools in hand (per example, if you have Kotor tool and rowse the game data, you will notice files with .uti, .utc.utp extensions - open them: a lot of their content speaks for itself and the tuts will make much more sense). Although it helps, you don't need any programming background to mod...in fact most members here, including me, have no programming background.
It's best to begin with a small project, such as editing .uti files (item properties and such) just to familiarize yourself with the files and the jargon. Once you've made an item, you could try placing it into the game, etc.
You will find some info here about the gff format here but I doubt it will be of any help for now:
http://nwn.bioware.com/developers/)