There is alot of good info here guys and gals!! Both of you should do a indepth how to so it can be a sticky!!!:gc-smiley-sign-i-ag Great advise, bit overkill for most.
Definately order with a WOOD roller. I buy from ebay, some include no roller, some plastic rollers, they break.
Roller and utility is only thing really needed. While yes, wiping it down, and heating it up is for best case scenario, I have found dynamat extreme that isn't years old will pretty much stick to anything. I honestly didn't wipe it down, and only heated it up in weird corners/angles that I could not use a roller on effectively. But again, my car is a 2012 so a 2009 or something may have more dirt/dust/carpet fibers. Anything hidden by carpet you should be able to wipe with paper towel and water for the most part. Use knife to cut it and to pop any bubbles then roll them down. Don't be afraid to change blades often, The aluminum backing dulls them quick.
And he is 100% correct only only using on exterior panels, unless you replace speakers. Then I would also do panels those are attached to. If you have a sub, rear deck and some interior panels will be needed to help keep vibration down.