I installed it myself and it took some time probably around 2 hours. The directions weren't very clear which was frustrating. I actually started backwards because it was easier to run the harness that way. They do give you everything you need and it is a really clean kit. I did purchase the bass adjuster.
1. it does come out easy. it just uses one seat bolt and the other is the jack handle bolt.
2. you did have to cut some carpet for a cleaner install but I don't see why you cant just lay the wires on top of the carpet. You don't have any splicing to do it is 2 connections that you have to make behind the glovebox which was a pain in the ass.
3.I just noticed this on the forum so I need to adjust mine. the amp is mounted on the box. It does give out some really good bass and I am very pleased with it.