This is a test of commonsense. Complete the next sentence:

How to fit a roller blind
Determine the placement of the blind.
Although roller blinds are typically installed inside of the window frame, it can also sit outside of the window frame or above the window. The location of the blind is personal preference.
Make sure that you determine where you would like to install the blind before buying the blind. Hold the blind up to the window to visually see where you would like to secure the brackets.