o?
for mirrors, i measure and cut a hole smaller than needed for the stem of the mirror (circular) so that it stretches, but doesn't tear, the material as I shove it through... heat will shrink the hole size back to normal, fine line and trim, peel back, remove fine-line, reheat and reapply.
(for measuring, I take a short cut by alignining my panel where I want to lay it down, and press my hand across it until I reach the edge of the mirror and draw a line where it creases and mark top/bottom like a "C" and then I cut my hole inside the marks.... I also usually start here as my first tile... handles are easy but mirrors are a pain to do this way)
for handles, I lay down fine-line masking tape before applying the graphic, cut, peel back the graphic without tearing, remove the tape, apply primer94, and reheat and lay down the graphic back in place. The customer should be aware that there will most likely be a "reveal" around the door handle, as you cannot possibly trim or apply a graphic where you can't lay/remove fine-line tape (noted, in case you don't know, trimming directly on a car panel WILL result in rust and deterioration of the edges of yoru graphic).