This forum's DIY section is great for sterio stuff. I replaced all my speakers and headunit with no experience and right after I got my 2000 Echo with this site's help alone. Check it out:
http://www.echodrivers.com/
go for it
You can use a very small screwdriver to remove the stereo and replace it with the new one, or you can purchase special removal tools.
Begin by removing the decorative cover to your stereo. Remove the stereo retaining screws. Slide the stereo out and remove the wiring harness. Reverse the process to install your new stereo.
take it to the Toyota dealership and ask them to replace it
Replacing a car stereo is not a difficult process. All you need to do is take off the face plate, unscrew the radio, and unhook the wires. Then place the new stereo in, hook up the wires, screw the new stereo in, and replace the face plate.
depends
what year?
when it breaks
about $1500 AU
Set the original stereo at a 6 degree angle and pull gently.
Pretty sure its the same as the 2000 Toyota echo, see related link.
$1500 to $2000