Vinyl siding can be installed in a variety of ways, but the most common is to install it vertically. First, you'll need to measure the length and width of your wall. Then, using those measurements, you'll need to purchase enough vinyl siding to cover your wall. Remember to buy extra so that you have enough to cut any necessary pieces. Once you have the siding, start by installing the bottom piece. Make sure that it's lined up correctly before nailing it in place. then work your way up, installing each piece one at a time. Once all the pieces are in place, trim any excess vinyl with a sharp knife. Finally, caulk around any joints where two pieces meet for a finished look.