Have you done a search on the site? There's quite a bit of info.
Also, does your car have other speakers in the footwell? If so, I'd personally forget the idea of using the dash speaker and put some decent speakers in the pre-existing stereo speaker locations. I believe that the term used by audiophiles for the the dash speaker is 'rubbish.' However, if it's the only speaker you have, I'm pretty sure the fitting info has been covered before on the site.