Owner of the plane decided we should go to IAD intstead of FME as it was closer to his hotel. We started getting vectors for the visual approach 19L near Baltimore and was asked for best forward speed. I told Potamac I could give them 170 and they were pleased with it. We landed and made a right turn and taxied all the way to Signature with tower. Signature was packed and there were at least 20 jets on the ramp. The GA terminal was amazing and rveryone was friendly. Pretty hefty bill after we got fuel but at least we got coffee and popcorn! Taxiing out was straight forward as well. I picked up the clearance and we taxied to 30 through the terminal ramp. Lots of taxi and hold short and change to frequency XXXXX. But the taxi instructions were pretty easy. Taxiing took about 30 minutes and I was able to do my run up holding short of a taxiway. Don't be intimidated by Class B airports!