Sounds like you have a wiring kit ? It really isn't that difficult to do - just follow instructions / take your time. Most Kit suppliers have pretty good Tech. Help lines if you get stuck. It is very important to get good grounding - amazing how many problems that can cause. Battery can ground to frame, or engine block. Body OK as long as you have a good connection between frame and body parts. Some guys run ground straps between motor, body, and frame to be sure. Decide where you want to put your Fuse Box, then all runs from there. Solder any splices, make sure crimp-on connectors are firmly on, and use rubber grommets where wiring passes thru metal. When I did mine, it was first major wiring I'd ever attempted - took a while but all works OK now.
