I could walk you through the install but the amount of time it'd take to do that would take an entire day. If you do not know what you are doing things can seriously get rough (especially for amp and subs). You can bring it to Geek Squad or a mom and pop shop but my problem with the audio industry is that shops can vary so much in quality.
If you were going to install it yourself you'll need a few other things:
- Radio Wiring Harness (Metra Part# 70-5511 or 70-5510 if the radio has RCA outputs for each speaker channel)
- Radio Installation Kit. You shouldn't need a full kit but a pocket to replace the lower CD Player which will be defunct (Metra Part# 88-00-9000) (I found the kit on eBay for $6 plus $6 shipping; Seller: hobbes_v2 Item#: 380220523155. They have 100% rating but I've never bought from them so I cannot vouch).
- Crimper, Crimp caps or butt connectors, zip ties and electrical tape.
These can be found at any audio shop or Best Buy, the tools and materials at hardware stores as well. You will also need Ford Radio removal keys which can be found easily from various places or I've read an adapted coat hanger works as well.
You will also have to attach a wire to the parking brake in order for the video to work.
The Amp and Subs are much more involved and you will need more materials
- Amp Install Kit (you can also pick this up at any audio shop)
- Crimp connectors, electrical tape, zip ties, crimpers, butt connectors
The Amp install kit should include: X-gauge power wire, ground wire, remote turn on, speaker wire, fuse holder and fuse, as well as usually a few crimp connectors, a remote line, and RCA cables.
You will have to run the power wire from your battery, through the firewall and through the interior to where you will be mounting your amp. So yes parts of the interior will have to be removed, most of which are just clipped in. From where you mount the amp you will have to run the ground wire (which should be short) to a spot on the chassis where it connects to bare metal, this is the ground. The remote line will be run from the radio to the amp as well as the RCA cables. This means that the radio will also need a RCA Sub output. The RCA cables and power wire cannot be run on the same side so you will have to be working on both sides of the car, going through the interior. Speaker wires will then be run from the amp to the subs.
Subs will also need to be placed in a box and the amp and sub should match up between RMS Voltage and Ohms.
And there you have a very brief overview of the subject.