Feel free to remain at your own comfort level when selecting weights. Select dumbbells with a weight you are comfortable lifting. Careful not to select weights that are too heavy and risk injuring yourself.
Anywhere from 3-12 pound dumbbells are perfect for this butt and thigh workout. I used 8 pound dumbbells for this workout, not too heavy nor too light. The following week I graduated to 10 pound dumbbells.
You can even opt to use your own body weight. You will still get an effective workout. The weights just add a little more so you feel a little more during and after your workout.