Removing mounted wall blinds is easier than installing them. First, if your blinds have a valance, take it out. They're mounted with a clip attached at the top of the headrail. Remove it by lifting it off the blinds. Next, open the brackets. You should have access to the headrail and mounting brackets.
Open the brackets by lifting the door or hinged side. Brackets feature a tab that keeps the hinged side closed. Now you can remove the window blinds from the brackets.
Last, unscrew the brackets from the window frame.