Step 1: Install Tackless Strips.
Use a saw or shears to cut a length of tackless strip to fit each wall. Nail the strips around the perimeter of the room; leave a space between the tackless strip and the wall that equals 2/3 of the thickness of the carpet. Using at least 2 masonry nails for each tackless strip, nail them to the floor. Make sure the tackless strips join together at the corners and the pointed pins in each strip are facing the wall. If you are installing carpet over tile flooring, remove the tiles where you are nailing the tackless strips.

Tip: If you are installing carpet over concrete, install a special gripper edge manufactured for concrete and fasten with masonry nails before installing the carpet.

Caution: To protect your hands, always wear heavy work gloves when handling tackless strips.

Step 2: Install Carpet Padding.
Cut the padding in strips long enough to fit the length of the room. Make sure the padding is long enough to cover the tackless strips on all the walls. Lay out your padding, waffle side facing up, and staple it along its edge every 6 inches. If you are installing directly over concrete, cement the padding to the floor. The padding should not overlap; padding pieces should be butted up against each other to form a clean seam. Use a utility knife to trim the excess padding that is covering the tackless strips, and cover each seam with duct tape.

Step 3: Cut and Lay the Carpet.
Measure your room's length and width, then cut the carpet 4-6 inches longer than the room's dimensions. Use a utility knife to cut the carpet from the backside. After measuring the carpet, flip the excess over a cutting board and use a straight edge to guide cutting. Overlap each piece of carpet at the edges to allow for trimming. Make sure when cutting and laying the carpet that its pile is facing the same direction.

Step 4: Cut the Carpet Seam.
Overlap the edges of the carpet, leaving about 2 inches of excess carpet at the wall. Snap a chalk line on the back of the overlapped carpet edges and trim a straight edge to ensure a straight seam. Overlap the straight edges and use a row cutter to cut the bottom piece. The edge of the top piece should be your guide in cutting the seam to fit.

Step 5: Cut a Length of Seaming Tape.
Center It Under the Seam Make sure the adhesive side of the tape is facing up and the carpet seams butt up against each other. Use a seaming iron to melt the adhesive by slowly pulling the iron down the tape. Once the adhesive is melted, immediately press the carpet edges together over the tape. Roll over the seam with a rolling pin.

Step 6: Use the Knee Kicker to Attach the Carpet.
Starting in one of the corners, hook the carpet to the tackless strip. Dig the teeth of the knee kicker into the carpet about 1 inch from the wall. Swiftly kick the cushioned end of the knee kicker with your knee to hook the carpet to the tackless strip.

Step 7: Use the Power Stretcher to Attach the Carpet.
Once one corner is hooked, use the power stretcher to stretch the carpet to the opposite wall. Put the base of the power stretcher at the wall that was just hooked with the knee kicker, and use a piece of scrap carpet (or a padded 2 x 4) to pad the wall. Dig the teeth of the power stretcher into the carpet about 6 inches from the opposite wall. Press down the lever and lock it into place, stretching the carpet and attaching it to the tackless strips. Next, use the power stretcher to hook the other corner opposite of the first corner hooked, following the same procedure. Follow the numbered sequence in figure 8, kicking and stretching the carpet until the edge of the carpet is attached to the tackless strip around the entire perimeter of the room. In the diagram, small arrows represent the knee kicker and large arrows represent the power stretcher.

Step 8: Trim Excess Carpet.
Adjust the wall trimmer to the carpet thickness, and trim the excess carpet at each wall. With the blade on an angle and the base of the trimmer flat on the floor, slice the carpet down the wall. When you get to the end of the wall, trim the last few inches with a sharp utility knife.

Step 9: Smoothing Out the Rough Edges.
Use a stair tool to push the edges of the carpet between the wall and the tackless strips.

Step 10: Install a Gripper Edge.
Finally, trim the carpet at the doorway, centering the end of the carpet under the shut door. Install a gripper edge or nail in a metal strip to hold the carpet in place.