HtR combat and skill use help.

Alright, for those of you wondering about if I own a physical copy of the OWoD book for HtR, I do. I have read through the combat rules and skills rules, but I still don't understand how combat works nore skills. I understand that the usual ranged weapons are 8 successes or more. I also understand that for mixing skills is rather simple but my main question is when would the dice modifier's for taking away dice for it. that's also kinda the same thing with combat I think.

Also, how does lighting, distance and such work game wise? I know the lighting would take away dice along with the distance.