Does someone want to do me a huge favor...

and explain to me how modding works? I have read the "tutorials" on the far cry 3 forums but i think that they assume the reader knows alot about this stuff alread, which i do not. I have Gibbed tools GUI downloaded, but I don't understand all this packing unpacking .fat .dat stuff. I feel like you can only install one mod at a time though unless it is a compliation, right? So how for example would I install the latest compilation mod?

thanks x1000 ahead of time.