ok first leave the film on the outside of the truck till you are DONE i mean DONE!!! like body is cut out holes drill for body posts everything i mean DONE!!!!

you paint the inside so the outside when you take the film off the outside looks clean and smooth. especially if you use mutliple colors and use tape to make a design. you wont see the ridges on the outside. the inside you will or might. you only have to tape one color off and not have to protect the first color from the second or third. just overspray the first and it will look seamless. just look online for a few tips and how to do it. it does take a few bodies to really get a hand on it.

and cutting the body out is a art. you can alway cut more off if you need to. so dont go wild on the first cut. use a sharp knife aka exacto knife or body sissors which are very nice, i finally bought some. but make a rough cut around drill the body holes then go back and forth between cutting and fitting on the truck/car.