As an owner of a car stereo shop for over 25 years I can tell you NOT to cut the panels. I mean Jeez, that's not even a $100 labor fee at a qualified shop! If my installers screw up those panels it would cost me $200-$500 in parts per panel. It would cost them their job! If you are impatient, get it done professionally, it's the quickest and in the long term, most economical and most sensible way to get it done