Hey,
Sorry if i'm late replying.
But its not too hard.
Work on it from the passenger side.
Stabilize it and remove the wheel so you can access it easier. But it can be done with the wheel on also.
You need to remove the holder. BLUE
Once off, the green part needs to be retracted.
You do that by screwing it back in.
Be sure the X on the piston is aligned back up so the pin on the rear pad will sit correctly.