Jbl setup with new HU and sub and amp lol

Ok guys after doing quite a bit of reading on audio stuff.

I have the JBL system, I have a new (used) HU in the mail, I also have a 12" sub and 500wat amo.

After reading it seems I might have to rewire quite a bit is this true? Im obviously looking to take out the old sub and amp.

Im starting to think about paying someone to do this but I hate paying people to do something I can do myself.

So any input, is their a guide somewhere? I searched but didnt find it..

 

No one replied, so albeit late, I'll throw down some knowledge here...

Keep the JBL sub and amp... its a one piece unit. Put your sub on t he drivers side and amp in the middle, or under the seat.

If you don't have anything to power your door speakers, you cannot remove the sub/amp assembly. It works, and its what I'm running right now.