[Style67]

Hello everyone this is my first post. I'm trying to upgrade everything on my tundra audiowise. I already got a new HU its the jvc avx800 doubledin touchscreen. Now i need to get my amps subs & new doors speakers Istalled. I got a nice oldschool (small) fosgate 4 channel amp puts out 60 x4 rms fits nice under the seat. haven't installed it yet though. The main question i have is how do wire up some components in my front doors? theres more than one wire and three factory speakers including the tweeter. Should i just run new speaker wire or should i try splicing into the factory wire? Is it tough to run new wire? It originaly had the crappy sounding jbl system. Sombody please help me out i'd appreciate it.
THANKS STYLE67