This instructable assumes that you understand basic sewing concepts.
Sewing tools required:
-scissors (good sewing scissors that can cut denim),
-a straight edge ruler
-marking tool (tailors chalk, or sewing marker - a regular pencil/pen can work too)
-sewing machine with heavy duty needle (size 16, 18 or a denim needle)
Step 1: Determine desired length
I have turned the extra fabric to the inside. I placed a pin at the outside and inside seams of each leg to mark the length I want. Be sure you do this to both pant legs.
Take the jeans off. At this point you need to determine the line you will cut to shorten the jeans. Lay the pants out flat. Compare the insides of each leg. If your pins aren't exactly aligned, place a new pin half way between the original pin on both pant legs to find the average desired length.
Compare the outside leg seams in the same way, adjusting the pins to find the average.