Vertical window blinds are commonly replaced due to broken, bent, or missing slats, and blind cords that no longer retract and extend the blinds. Generally, these problems can be easily repaired in an hour or two, saving you the cost of new blinds.
Make sure the blinds are pulled down to their full lengths, if the lift cord allows. Remove the blinds from the mounting brackets. This is easily done by sliding the top rail of the blinds out of the mounting brackets, although for some types of blinds and mounting brackets, you may need a screwdriver to take the blinds down.
Use pliers to remove the caps on the top and bottom rails of the blinds. This will allow you to remove the rail from the blinds and fix problems in the top rail's mechanics and lift cord, and to remove problem blinds. You should be able to slide the railing off or remove screws and then remove the top and bottoms rails.