First Leg Departure and Altimeter Issue

What happens here

After completing pre-flight, the pilot taxies the aircraft to the runway, which at Air Harbor Airport is uniquely half grass and half pavement. He explains that landing on grass is easier on tires and provides a smoother experience, while pavement requires more braking. He then recounts his initial departure for Virginia Highlands in Abingdon, Virginia (113 nautical miles away). A crucial mistake was made: he forgot to set his altimeter to the correct ground altitude (820 feet), which is typically done after getting local weather from air traffic control once airborne. This oversight led to early confusion and a need for a flight following, where ATC provides guidance without being fully controlling.

Goal: Successfully depart for the first leg of the flight, manage initial navigation, and address equipment settings.