2. Put on appropriate safety gear. This is really important. As a minimum, you need a good dust mask, preferably a 3M activated carbon one, and some thick leather gloves.
3. Proceed to demolish the wall, and feel pleased at how easy a job the DeWalt is making of it.
4. Make sure that you spend at least half the time holding the drill by the body, specifically with your hand covering the vent slots. Don't worry, you won't feel the excessive heat because you're wearing leather gloves.
5. Carry on demolishing the wall for about 1 hour. After this time, you will notice that your drill has lost some performance. Remove your safety gear to investigate.
6. Marvel at the unbearable stench of burning insulation, and at the extreme efficiency of your mask which meant you couldn't smell it before.
What to do next:
Presumably you still want to demolish the wall, right? Get in the car and drive to the nearest B&Q (40 min drive). There you will discover that the only SDS with rotostop they have in stock is the PP one. Buy the PP drill for £25, and go back home. Finish demolishing the wall, all the time marveling at how heavy this bastard is compared to the poor DeWalt.