Same goes for gas. I just find it easier and quicker to do it myself than to wait for the attendant.
That’s only for cars. For planes its the opposite.
At airports with a fuel truck available, I always call the fuel truck. It saves a lot of time, and I can preflight or tie down the plane without taking time to refuel by myself. Many airports do not have a fuel truck available, so then I have to refuel the plane myself from a self serve.
Captain™