Head Unit Removal Need Help

I have sirius radio and i just got the direct connect adapter and i am trying to figure out how to get to the cables of the radio without breaking anything. I have that there are "removal keys" that are used to remove the radio but i dont have them and im not sure where to get them either. I was wondering if there was a way to do it without the keys? Or Where i could find them and are they expensive? Anything will help

You can go to any local car audio store and they will remove your radio for about 10 bucks. Its cheaper to just have them do it. Those keys are about 30 bucks.