Sound deadener install

[limp]

Will be installing my carpet soon and I need to install the sound deadener matting I purchased.... Never done this before and I was looking for some advice to get me going
12 X 18 sheets.. Do I start on the transmission tunnel and work my way to both sides and back? Or can I just lay full sheets than come back and fill in? Can I overlap the material? Some of the original " tar " based sound deadener is still in a few areas.. Do I need to remove all of it or can I go over it if its not flaking off??
Did purchase a 3 pack of rollers to roll the new stuff down.....
Any advice is appreciated...

 

[General karthief]

I used Dyna Mat on the Junk Pyle, after scuffing the worn areas that had surface rust, etching primer and rattle can leftovers, I started at the toe boards where the firewall insulation stopped and worked my way back to the tailinghts, full sheets first then cut and filled the rest.
Made a difference, before the carpet got really warm but after a noticeable difference, road noise was reduced also.

 

[AeroCoupe]

Just me but I removed all of the old sound deadener. Just because it has good adhesion now doesn't mean it will later down the road and then the deadener is useless. You do not need 100% coverage. When I did the Coupe and the T-Bird I checker boarded the matting. This is what we did at the car stereo shop I worked at and it performed well and did not cost as a much.