You are taking the back of the car apart. . . but its easy. Just be careful of the defroster mounts.
I installed component Infinity reference speakers in the front (door for the mids and sails for the tweets) and rear (OEM mount for the mids and deck for the tweets). + sub, x-overs, amp, etc. I still am waiting on upgrading the head unit until there is a good iPod integration solution (I'm not a fan of Alpine's current offering)
Since you'll be powering the speakers with the stock head unit, I highly recommend efficient speakers (The Inifinities happen to be pretty darn efficient and are relatively inexpensive:
http://www.crutchfield.com/S-0vPt7eT...10&I=1085000CS ) If you purchase from Crutchfield, you'll get comprehensive install instructions. If not . . I can scan mine in and send them to you - let me know.