I don't no about repacking them but a pad change is pretty easy....
U just unbolt the caliper pull the old pads out, then u will have to push the pistons back in that push the pads onto the discs
There is a special tool u can buy to do this but a g clamp or f clamp works well just push the piston back in with the clamp than put new pads in and refit the caliper put ya wheels back on but remember to give ya brake pedal a few pumps so u go a firm pedal before u go anywhere n u should be right to go!