I really want to edit the amount given for quests and I could'nt really find anything that could help me. Is it possible to do so?

You'll need Kotor Tool and the K-GFF Editor to change that.

In the global.jrl file (Under: Kotor Tool > K2 > BIFs > dialog.bif > Journal File, or K1 > BIFs > _newbif > Journal File, depending on game), you'll find all the quests within the game. Open that .jrl file with the K-GFF Editor. You'll have some searching to do to find the one you want, either look in the comments or tag field of each struct ID (each quest has its own "struct ID"). Once you find the quest struct ID you're looking for, find the struct in the dropdown list under "EntryList". Look for the "End" in this that = 1. That's the one that obviously ends the quest and hands out that XP. Stay in the struct ID with the one that has End = 1. Below it, it says "XP_Percentage". Changing that value will determine XP given. An XP_Percentage of 1.0 = 1000 XP, .9 = 900, .8 = 800, etc. Change it to whatever you want, save the .jrl file under the same name, then put it in your override folder in the game directory.