Its so much easier to put small sheets of sound deadner on like 8"x8" or up to 10"x10" or 12"x12" rather than large pieces for me.That way I can roll and make sure that it sticks well after preping and cleaning with alcohol,.. I use a heat gun to warm up and roll on to stick better. I have ran up to 5 layers of 80 mill. before in some areas. You can cut with a sharp pair of shears or scissors to fill in gaps,.Work all four corners around them, Not hard, easy enough. Dont expect to be able to do the entire trunk in one day if you want to do it correctly and look decent/Nicely done.,unless its slapped on.