I have a 1998 4dr Chevy Blazer. It rattles a lot and i wanted to put deaden it to stop this noise and so I can hear my stereo clearer. I don't know a thing about sound deadening. So I wanted to know about how much of it I would need for my truck and what kind would be best. Also, can it go inside the dash aswell because I get a lot of noise from there too. And my last question is how much would it cost to buy it and have someone put it in for me? Thanks a lot for your help.