How to do a car audio DIY?

S40s1

New member
I am doing a diy on my car;s audio system but need help because i am not good with electronics. I want to know what i have to buy and also how to make the relay.
Here is the link to the diy im following:
http://forums.swedespeed.com/showthread.php?105447-HOWTO-AUX-in-for-your-V50-basic-sound-system

( I am just doing what is on the first page. Posts #1 and 27)

Thanks
The writeup that im folloing is for installing an auxilary input and its not a regular procedure. The person who wrote the DIY discovered this, so any installation helping sites arent going to help me. I need somebody with knowledge on circuit boards and/or electronics
 
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