I think no matter how much you want to do it yourself, at a certain point, you'll have to pay someone somewhere down the road.
I wouldn't say car audio is easy, especially for someone who hasn't done it before. I had to get my friend to help me out the first time.
Mattman, There's only so much someone can do you in terms of audio, in the end, it really depends on what sounds good to you!
Have you decided on what you want? Brands? How much you want to spend?