Removing the motor, if you want to go that route, is easier after loosening the caliper. Otherwise the screws are difficult to access.
I always remove the motor, each time I maintain the brakes. And that I do each time I switch between summer and winter tires. Thus I never have any problem getting the screws out. Grease is your friend. Controlling it electrically sounds easy, but my experience is that these plastic connectors tend to get brittle over time. I prefer handling the motor, in spite of being in the electrical profession myself...
Rotating the little jack in there, the one the motor otherwise rotates, is best done with an XZN 8 key. But everything that fits will turn the jack, as it rotates freely.
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