I've never had a problem drilling CF, and I've gone it extensively working with model airplanes and boats. Couple things to keep in mind. One is the fibers will splinter when the bit exits, so if you can, back it with something. Use a higher speed with less force. Second is that CF dust is like asbestos. Once it's in your lungs it stays. Keep your work piece wet with oil or water and wear a respirator. If you smell it, you're inhaling it. Having said all that, don't get scare away from working with CF. Once you've done a couple jobs with it, you'll understand how to work with it and see that's it no harder than any other material.