Dont buy sony amps if you can avoid it. The whole line is spotty at best. If you'd like some good low cost amps, how about US Acoustics?
I installed a sony Xplod head unit in a Camry, it took all of 3 months to self destruct.
Don't buy Sony subs, either. I had one, it sounded like a wet fart.
http://thezeb.com/caraudio/usacoustics.html
You'll need a soldering iron, Solder, obviously
screwdrivers
7mm (I think its 7mm) socket (standard size to remove head unit)
Don't get a capacitor.
if your car cant produce enough juice (and it should) you should rather go with a yellow top optima and upgraded alternator and wires. :-)
[Modified by Kale, 10:37 AM 6/21/2002]