RE: Doing my first.... Help please.
1. yes you can sand/file the edges, but try to cut as straight as possible, then sand to smooth them, normal fine grit sandpaper will work fine, but a dremel with sanding wheel is best for the wheel cutouts ( use on slow speed or the lexan will melt)
2. I only ever use a drill to make post holes, then smooth off with a dremel and cone shaped fine sanding stone.
3 before you spray, you should scrub the inside of the body with a scouring pad to key the surface for the paint, DONT scuff the windows though, then wash out with soapy water and dry well, apply the window masks, then spray away.
Spray in thin coats then leave for 5-10 mins between coats, dont leave too long between coats, as if the surface of the paint dries, the next coat wont stick so good.
Tim