I would use a better driver with a top that swivels so you can press down on it with the thumb or palm of one hand and turn the body of the driver with the other. Also got for the screws that you are having problems with first leaving the others ones in to try to relieve any possible pressure on the bound screws. Here's the type of driver I use for this: https://www.ifixit.com/Tools/T5-Torx-Screwdriver/IF145-039-2