The skirting board will be attached to the wall with screws or nails into the ground boards. Ground boards are pieces of timber attached to the bottom of walls, usually at 24 inch spacing. The first step is to pry the board about 1cm away from the wall to access the rear of the board and the screws or nails.
Wear protective gloves. Balance a crow bar against a piece of wood to protect the wall, as shown, and carefully prise the board away from the wall. If you have trouble getting the crowbar in, first prise the board off the wall with a flat head screwdriver or chisel, tapping it down between the board and wall.