A window covering looks like a small job until the room depends on it. Light comes in at the same angle every morning, and glare lands on the bed. A shade that is measured once, mounted once, cord-checked, and tested through its full travel will do its work without a second trip up the ladder. This is an install from start to finish, and one careful person can usually do it in one sitting, provided the wall cooperates.
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Choose the cord before the color
Start with the cord, not the fabric. A cordless shade removes the cord hazard completely. A corded shade needs a cord stop or a cord tensioner that holds the loop tight to the wall, out of reach of a small child or a pet that might climb. Loose window covering cords can injure young children, so the cord question is a safety decision before it is a style decision. If a child or a pet visits the room, choose the cordless version or fit the cord stop before anyone uses the shade.
Measure inside or outside the frame
Decide whether the shade mounts inside the window frame or outside it. An inside mount needs enough depth in the frame and looks clean, but it can leave gaps at the edges that let light through. An outside mount covers the trim and blocks more light, but it needs clear wall space on each side of the window. Measure the width at the top, middle, and bottom. For an inside mount, use the narrowest number. Measure the depth too. Write the numbers on a card and tape the card inside the cabinet door where the next person will find it. Check where the bed sits and where the lamp is, so the shade's travel does not run into the bed rail or the lamp.
Find the wall before the drill
Locate the studs with a stud finder and mark them. If the bracket lands on a stud, use the screws in the kit. If it lands between studs or in plaster, use the wall anchors the kit provides, or stop and ask a handyman who works with that wall type. A bracket that pulls out under the shade's weight is a failure that shows up only after the shade is up. Set each bracket level with a bubble level. Mark the holes with a pencil before drilling, drill slowly, and keep the bracket square to the frame.
Mount in the order the package gives
Most kits go up in the same order: brackets, then the headrail or top of the shade, then the fabric or blind. Follow the order in the instructions for your own kit, not from memory. Snap the headrail into place, check that it sits square, and confirm that the bracket releases the way the instructions say. Do not force a part that does not seat. A part that will not seat usually means the bracket is off by a few millimeters or the parts came from a different model.
Test the full travel
Raise the shade to the top and lower it to the bottom several times. Watch the edges for light gaps, the bottom edge for contact with the sill, and the cord or wand for any snag. Check the stop at the top, and make sure the shade clears the bed rail, the headboard, and the lamp at every height. If the shade is corded, mount the cord stop now, pull the loop tight, and check that the loop cannot be reached from the bed or the floor.
Write down what you did
Leave a note with the bracket type, the cord stop model if there is one, the mounting height, and the name of the store or the kit. The note saves the next person from guessing when a part wears out or a replacement is needed. Keep the instruction sheet with the note, and keep any leftover screws in a labeled bag. The room will change, and the shade will come down again someday, so the note is part of the install.