in general, the biggest b**** of the whole thing is getting through the firewall, particularly on honda-acura cars. It took 6 hours for me to run wire from under the hood to my trunk on my acura legend with some experienced help. probably 2 of that was absorbed with getting through the firewall. It sucks. But after that, its smooth sailing mostly. The latter half of the 6 hours includes running the RCAs to my trunk through the cabin.