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Measure and cut a corner post, so that there will be a 1/2-inch gap between the top of the post and the eave of the house.
Measure the length of siding needed. Mark and cut the piece to length. Use snips to cut through the flanges. Continue to cut through the material, cutting the rest of the J-flange.
Nail the corner post at the top of the post. Check for plumb. Fasten the posts every 12 inches.
Determine the lowest part of the wall that will be sided. Make a chalk line across the house for the first horizontal piece.