Yup, it’s that easy. Be careful with the bit. Some cut for a 3/4” inner diameter pipe. That would be too big. To check, take the ring off the NMO mount and see if the bit fits inside it (or inside the o-ring at least). As for the grease: most antennas come with an o-ring or rubber gasket. I’ve never used grease and never had any corrosion issues when the rubber parts are used and properly tightened. I tape off a 6x6 square, take my measurements to center the mount, mark, center punch, and drill. Always be sure you have clearance (or control) so that you don’t punch through the headliner. I didn’t read what wavelength antenna you chose but a rough guide is to make sure you have it’s length I’m clearance around the mount. These things are super easy to do. I’ve done 6 holes in 3 different vehicles. I don’t even drop the headline, I just use a wire hanger to fish the cable over to the edge where I can pull the rest through (which reminds me, be careful pulling the coax through your new, sharp hole!). Sent from my iPhone using Tapatalk Pro