I have a 99 honda odyssey and the radio install is not that difficult. Watch the video and you will see.
This is how now to order at a drive thru window.
This will show you how to remove the stock radio so you can replace it with an aftermarket unit. This will work for a 99 to 2004 model odyssey.
This method works for most cars and both rear doors just fyi.
Simple how to video showing how I remove the radiator hoses from my 02 trailblazer without removing the alternator.