You don't need a bulky, heavy drill/driver to replace a light switch plate. For simple, light-duty fastening projects, go with a power screwdriver. Go with the Geepas Electric Screw Driver. This compact device has plenty of functions that combine the portability of a hand screwdriver and the efficiency of a drill/driver in a single tidy package. It has a variable speed gearbox that fluctuates between 0 and 4200 rotations per minute, activated by a larger-than-normal trigger for your own precise control.
Even more, control is afforded to you from the notched rubber over-grip. Bit changes are made simple rotating hex shank to release force as required. You'll just have to plug them in to be able to get going with a powerful 500W motor which will help you to complete the work quickly.