I did mine on the bike, I removed the outer fairing, and the gas tank, tapped the inner fairing up where I wanted to put the holes. I made my own templets up out of cardboard, I used the speaker grill as my outer diameter, and cut the center hole of the cardboard out so the speaker would just fit inside, and used that to marked out the holes, and used a Dremel with cutoff wheels to cut "actually more like burn/cut the plastic" for the speaker holes, it wasn't easy but can be done, the smaller tweeter holes in the front, I used a holesaw. I know it is hard to make the first cut, but once it is done, it is so worth it.
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