Mark where you want your brackets to be and then hang them in place. You may need to use drywall anchors to hang your brackets depending on what type of walls you have and how heavy your curtains are. If you are hanging an extra long curtain rod, it is probably a good idea to make...
Another way to help teach to use the right amountis on the wall where the toilet paper roll, roll down how much the kids should use and mark a line on the wall where it stops or mark with a piece of tape. Of course this is not set in stone but just gives a guideline to young ...