make sure the handbrake is off when rewinding them.
take out caliper
guide pins, the discs will come off without removing caliper brackets, undo retaining screw, be gentle they are fragile.
take disc out.
take old pads out, note which way they came out
use wind back tool to retract the piston, not forgetting to undo fluid reservoir cap.
wind piston in fully, dont force it. if pads are bare then the piston may have fell off the threads.
replace pads, use copper grease on the backs to stop squeal.
disc back on, caliper back on.
pump pedal before test driving... dont forget to replace the fluid cap.
job done.
really easy, put some copper slip on the hub aswell before putting the discs back on.