Unplug the power cord from the electrical outlet. This will prevent the possibility of electrical shock.
Lay the DC07 on its side and push the vacuum head forward to fully extend it and give you better access to the hose.
Grasp the rubber cuff at the top of the internal hose which is attached to the upper vacuum sleeve. Pull the cuff down, wiggling it until you have detached it from the sleeve.
Grasp the cuff-free end of the internal hose. Gently twist the hose until you gave detached it from the bottom vacuum sleeve.
Place the cuff-free end of the new hose onto the sleeve of the vacuum head. Carefully twist the hose until it is securely fitted onto the sleeve.
Place the rubber cuff onto the upper vacuum sleeve. Push firmly until the cuff clicks onto the sleeve. Turn the vacuum cleaner upright.