jremington:
Another hint: do not use the Arduino to power the servo, as that could damage the Arduino or cause it to malfunction. Use a 4xAA battery pack and connect all the ground leads.
Good to know.
The Adafruit video seems to show that the servos are being powered by a PC's USB port. The servos are being controlled by their Trinket Pro.
It looks like I can run a simple sketch to sweep each of the servos using the simple sketch https://www.arduino.cc/en/Tutorial/Sweep