Toyota Repair: 2007 Corolla Stereo Removal, new corolla, factory equiped

Question
In January we bought a new corolla.  We've been extremely happy with it.  Now we'd like to replace the Factory equiped stereo.  It is a 6 CD changer with a 6speaker jbl system.  The model number on the factory radio is A51814.  I've looked up and down on the web for my 2 questions:
1. If I install an aftermarket stereo, will it void my warranty?
2. How do I remove the stereo?

Answer
It may void the warranty is the original wiring is altered to install the new radio. The plastic covers around the radio can be pulled off, remove the shift console upper cover and look for some screws, remove them, the with a small plastic tool or a small screwdriver remove the cover surrounding the radio, there are four screws that hold the radio in.