Unfold the hem completely so that it hangs loose. We are going to iron a 1/2 inch fold.
Plug in your iron and let it heat up. Some fabrics are not heat safe, and will actually melt when an iron is applied, so test a small area first. This step is a great way to test your pants to see if they can be ironed in the future. Checking the tag can sometimes give you this information. When in doubt, lay a damp towel between your iron and the fabric. Iron about a 1/2 inch fold to give it a nice crease. Repeat with the other leg.
When your ironing is complete, we can see how long you want your hem.
