Quoted from Bryan_Kelly:
I prefer using the edge of the cabinet as my straight edge. I use a utility knife and hold it at a 45 degree angle to the surface as you cut. This extends the decal all the way to the edge and makes it hard to tell its even a decal. When done properly, you can run your finger perpendicular to an edge and you won't feel the decal.
Bryan , how do you make sure the blade doesn't slightly cut into the wood edge and cut in a gouge ?