Most people can fix a flat tire, given the right tools and a little bit of know-how. It's a good idea to know how, because you never know when you'll be stranded on the side of the road with a flat.
The first thing you'll need to do is loosen the lug nuts on the wheel with the flat. You'll need a lug wrench for this. Once the lug nuts are loose, you can jack up the car and take the wheel off.
Then, you'll need to remove the tire from the wheel. You can do this by prying the tire bead over the rim with a tire iron. Once the bead is over the rim, the tire will come right off.
Now, it's time to patch the tire. You'll need a rubber patch and some vulcanizing cement. Clean the area around the hole in the tire with a wire brush, then apply the cement to both the tire and the patch. Put the patch over the hole and press it into place.
Once the patch is dry, you can put the tire back on the wheel and inflate it. Then, put the wheel back on the car and tighten the lug nuts. You