^
You should be using a Fender Roller to do the roll+pull first.
Phonebook/Newspaper method is only used for that extra bit of clearance
Please, for the love of god. Do NOT use this to do your fenders from the get-go. While it works, it's not gonna be even, and you're gonna be pulling sections of metal out further than other sections.
If you only need a roll, get a Rubber Mallet, and a Hammer Dolly.
This thing
Clean + Tape the exterior.
Heat.
Dolly over the tape.
Love tap evenly. Go slow. make sure it's still warm to the touch.
Light taps to start it off. Once it gets going, go a little harder.
Great post man.