The answer to 'how to install shingles' is to properly prepare the roof, lay the underlayment, and carefully install the shingles in an overlapping pattern. This involves measuring the roof, removing old shingles, securing the underlayment, and nailing the new shingles in place with a roofing nailer. Safety precautions include wearing protective gear, using a sturdy ladder, and securing the work area.
Shingles should be installed by a professional roofer, especially for complex roof designs or steep pitches. Homeowners may be able to handle simple shingle replacement on a basic roof, but it's important to follow all manufacturer instructions and safety guidelines closely.