Firstly, measure the depth of where your brackets will go. Check how far your handle and any other obstructions stick out from the window, then use this measurement as the minimum distance for mounting. Then mark your drill holes using the brackets, drill pilot holes and insert wall plugs into them. Then install the brackets by screwing them into place. If you’re using a centre bracket, install it slightly off-centre to avoid any cords. Open up the brackets and slide the headrail into place, before snapping the bracket arms back to secure it. Then install the child safety cleat and tie the cords around them.