Ok , I know next to nothing about car stereos, and I am buying 1 12" rockford-fosgate punch stage 1. I need an amp to go along with this, so i need some suggestions. I have a sony X-plod head unit some blown-ass speakers that are about to be replaced and it is not mach460. Now after I get this amp, I want to install my sub in the spare tire well. my question is, how would I do this, and if i paid someone to do it for me how much would it run??