Thanks for the tips and doing this with included pics. I am about to do my doors on my 17 Silverado LTZ. I have no idea what I am doing but have seen so many confusing and conflicting things it's a sound deadening rabbit hole! While shallower than the car audio rabbit hole it's still a PITA! Now I am wondering if I go behind the collision bars on the inner door or over them with the 80mil kill mat? Also, not sure why but my rear doors didn't have the square chunks of insulation between the inner door surface and the collision bars? All that is there is some tiny chunks of black spongy crap! I can't recall but I think that door had bee. Taken apart at the dealership before for a repair. That's pretty shady and am going to get their ass if they did that shady crap! I have had the worst experience of my life dealing with Chevy dealerships here in Dallas area. Never, ever, ever go to 5 star Chevy in Carrollton/Farmers Branch, TX! Anyway, I was thinking it would be great if anyone who knows what they're doing would make a step-by-step guide for applying these sound deadening products. A pattern would be great too. I was not going to take pics of my install but now have changed my mind just in case it can help anyone. I am stuck on what tape to use on sealing the joints and edges of the 80mil Killmat. I bought like 4 different rolls of aluminum tape because I couldn't find a definitive answer on which to use? I believe they're all made by Suretape or something like that. I also bought some plain ducktape brand Aluminum HVAC tape and some frost king pipe wrap insulation tape. Most of the Suretape ones are Aluminum front and looks like butyl or foam back HVAC tape. If anyone knows please let me know because I am stuck.. the closest thing I can find is the second skin Aluminum tape and I think dynatape or something like that but of course they do not list what the materials are. Thanks again for any help!