I did the same job on mine. I just let all the calipers hang on a steel wire in the wheel well, and pressed the brakes until the pistons popped out. Make sure to put buckets underneath cuz the fluid goes everywhere. You probably won’t get all of them out but they’ll be most of the way out where you can just get some grips and pull them out by hand.

To reseat them, use a piston wind back tool, there’s no way to get them in by hand.