1. Buy some superworms.
2. Provide a ventilated tub with substrate eg oats. Add veg for moisture and food.
3. Once fully grown, seperate them into small containers without food
. They curl as in the pic, then pupate.
4. After a few weeks, you will have beetles. Keep in a ventilated tub. Feed well and provide area for them to lay eggs.
Getting them to pupating stage is dead easy, just make sure they are fully grown before seperating.