Speaker Installation

I am looking to upgrade the speakers in my 2005 Galant. I have gotten the bottom of the back seat off, taken out the three bolts in the bottom of the back of the seat but can't figure out how to get the back off. Are there clips similar to those on the bottom seat? Any help on how to get the back of the back seat off would be appreciated.

Secondly, I don't know how to take my front doors apart to get to the front speakers so I can get the size and replace them. Once again any suggestions would be greatly appreciated.

I want to do this work on my own so I learn and to keep costs down so if anyone knows where there are any manuals for me or if someone on this forum could give me suggestions that would rock.

Thanx