should be pretty obvious mate, unclip the handbrake cable, undo the flexi brake hose into calliper, remove 2x bolts holding calliper to carrier, then prise back with a screw driver.
if your doing what i mentioned above, get some penatrive spray onto the brake pipe/flexi pipe connection, this will probably cause the most problems.
if your only changing pads, undo 2x bolts and prise off, youll then need a calliper wind back tool and wind the piston back, when doing this remove the cap from the brake fluid resoviour and make sure it doesnt overflow