Measure your installation height at 2 ends above the window frame.
Double-check that your installation height is levelled and points are properly aligned..
Mark your drill holes. Carefully drill your holes using the right drill.
A few screws and red rawl plugs would be required to fix the brackets in position after drilling.
Clip your blinds into the brackets, and clip the handle design that is used to lower and raise the blind to the bottom rail.