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If the stairs are already covered in carpet, you will need to remove the old carpet and possibly the carpet pad. Any damage to the stairs like cracks, loose boards, or creaky treads may also need to be repaired. You may also want to sand and refinish or paint wood stairs before installing a carpet runner.

No, thick carpet padding isn’t necessarily better than thinner padding. The appropriate padding thickness will depend on the type of carpet and the amount of foot traffic in the area. 

For example, thick padding works well in low-traffic areas, like bedrooms, where you have soft and plush carpeting. However, thick carpet padding can damage low-pile carpet, which is used in the busiest parts of your home (like hallways and entryways). For that reason, it’s best to use thinner, heavier padding underneath carpet in high-traffic areas.

It’s a good idea to install a rug pad under the carpet for your stairs. To make the pad fit, you’ll need to cut one section for each stair tread that’s about one inch narrower than the stair runner so that it won’t be visible once the carpet is installed on top.

While it is possible to install carpet yourself, it is a challenging DIY project that requires precise measurement, proper cutting skills, and knowledge of correct installation techniques. The process involves multiple steps, including removing old flooring, installing underlayment and tack strips, and stretching the carpet to prevent wrinkles, which can take several days to complete.

Before starting, consider these factors:

• Warranty: Many manufacturers' warranties are voided if the carpet is not installed by a professional.

• Tools: You will need to buy or rent specialized equipment like a knee kicker, carpet stretcher, and seam roller.

• Complexity: DIY installation is most suitable for simple, straightforward rooms. Projects involving stairs or floor vents are significantly more difficult.

• Cost: While you can save on labor, the cost of tools plus the risk of expensive mistakes—which may require re-installation—can make hiring a professional more cost-effective in the long run.

Given the potential for errors, voided warranties, and the need for special tools, hiring a local carpet installer is often recommended to ensure the job is done correctly and safely.