My sister Genevieve is an expert solderer. Her hands are small, steady, and well practiced. Here is a picture of her soldering a voltage regulator for our Spirit II Mars Rover project.
Here is a one minute video of Genevieve soldering the header pins onto a circuit board. We use this circuit board, which has more than a hundred solder points, on our flying drone robot. Note that she is using the proper technique by applying the tip of the soldering iron to the pin and hole, then bringing in the solder from the side.
Solderer: Genevieve (9 years old)
Director & Videographer: Camille (11 years old)
Editing: Camille, Genevieve, and R.