open the back. Remove the stem, and crown. release the movement clamps. carefully drop the movement, with dial attached into your hand. Remove the hands. remove the dial by releasing the dial fixing clamps. reverse this is to install the new movement.
You will need good quality jewelers screwdrivers, hands pulling tools, hands pressing tools and a way to unscrew the case back and some silicone grease to lubricate the O-ring before you attach the case back.
If you are uncomfortable with the idea of man-handling something as delicate as the hands of a watch, then please have someone qualified do this.