Before answering this question, think of a basic woodworking situation. You need to cut 1/8 in. off a piece of trim, or you need to cut a vertical and a horizontal piece so they mate perfectly at the ends. Trying to do either task without a miter box or equivalent (something that holds the piece and the saw in alignment) would be very difficult and time-consuming. Yet, this simple fixture allows you to perform the task quickly and accurately.
Common repair tasks are often performed with the “no miter box” approach. To make your repairs more efficient, video a few of the most commonly performed ones. Then watch to see which steps seem to require three hands or some ad-hoc method of supporting the work.
The equipment manufacturer may offer special jigs or tools. Your electrical distributor, local hardware store, and big box home repair center probably have tools that could be used, or adapted, to simplify the work process. Take the video of a given repair job with you and ask for a recommendation of something that will make this or that subtask more efficient.
For example, your video shows Bob tucks a flashlight under his chin; an LED headlamp is a better solution.