Scrape the floor with a floor scraper and sweep around the walls with a broom to provide a clean, smooth surface for installing the carpet strips.
Place the carpet strip around the room along the walls, with the pins pointing toward the wall. Space it out from the wall a distance equal to 2/3 the thickness of the carpet. Follow the contours of the wall exactly, cutting each piece to length with the shears.
Drive each nail with a single, well-centered blow with the hammer. A glancing blow will chip the concrete, rather than penetrating and sticking. Use at least two nails per section of strip. Some tackstrips have masonry nails built in; others require separate masonry nails. Either way, the nails must be hardened steel nails designed for use in concrete.