changing factory speakers.

Hello!I've been trying to change the speakers in my camry .But the thing is when i try to take off the front door pannel all the screws on the side of the door and the bottom come's out but then the pannel still won't budge.Now i've been trying to change the rear speaker's as well but i can't find out how they come out because the cover's don't budge and they don't come out from the inside of the trunk either.So cg can you please tell me step by step how to take the front and rear speaker's out so i can put some better high performance speaker's in them because i had to change the toyota factory stereo because the cd kept skipping and damaging my cd's.Please explain to me carefully especially with the rear because i tried everything and i just can't see how they come out!And i'm very good with my hand's.But this is the first toyota i ever had and some thing's are more tricky than american car's.So e-mail me asap . Thank you!