The whole thing is prety simple. I bought mine and had it installed for 55$ all together. Then you run your own rca's, amp kit, and REM. then hook up your amp/sub wherever you wish. or have it all installed. But i did all that my first time ever isntalling anything and it was very easy to do.
Remember, you can always run the high level outputs back to the amp as well, as long as the amp can accept high level input. You don't HAVE to convert them to rca, but then again it would be much easier.