the door panels are a little iirritating to remove, they are held in by the plastic brackets that u have to pull out so once you get all of the screws out its still gonna b pretty secure, just pry it lose from the bottom and work ur way around all the sides.
2 things to bear in mind
1) make sure that you put some weather stripping around the contact area between the metal door and the speaker to reduce buzzing and make sure the screws are TIGHT
2) TEST it before you put the doors back on, the wiring in mine was different colors than all the references said for EVERY step of the stereo wiring process -_-. Make sure you hook the - and + wired to the correct part of the speaker otherwise they will be out of sync and sound funny.