So i was going to replace the speakers in my front doors in my 2000 silverado, I'm not quite sure what size i need ive seen 6x9 and 6.5 but not sure and are there any other speakers in my truck that i might replace as well? rear door? i also planned on replacing my receiver because the stock one has no lights working except the time and i would just like to upgrade so i know how to pull the door panels off but other than that is it pretty easy just unscrew and unplug speakers? Im not quite sure on the receiver though, i know you buy a new harness whereever you buy from, im guessing pull the dash trim guard off then pull the old one out and unplug wires and put in new harness and reciever? but im not exactly sure. Thanks in advance!