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Miter the ends of a J-channel trim piece to fit two channel widths wider than opening of window. Attach the trim piece under window (image 1). Cut the side trim pieces to length, and install them on either side of the window (image 2). Nail the trim piece in place on top of the window (image 3).
Cut the first piece of siding to length. Install over the starter strip.
Nail each siding piece so that it is not driven all of the way into the house. There should be a gap of about 1/8 inch (image 1). Overlay each successive piece of siding to cover the house (image 2). When planning to overlap siding, you may want to overlap the material so that the top piece is closest to the house’s front door (image 3). By overlapping away from the house, the siding appears seamless when looking at the exterior from the front door.