Car radio exchange

Huhu Together. I intend to exchange my Ford Radio 6000. I just read here in the forum and on the net and got me an aperture and ISO adapter, as well as an antenna adapter. My friend now has an older Sony radio over. I would like to install that before I buy a new radio for approx. 100-150 EUR. Now I would have some questions about the installation. 1. Do I really have to disconnect the battery? 2. Do I need to change any cables on the ISO->Ford adapter so that I don’t have the Bat Is there a way to put the cable from the CD changer into the passenger compartment without a borehole in the middle console? Thank you very much already in advance. As I said before, I’ve been driving around here, but I haven’t found any clear answers to my questions. If one or the other question has already been answered, it would be nice if you would provide me with links to relevant forum posts. VG Flow