If you’re like most people, you’ve probably found the need to have a pair of pants shortened at some point. Hemming them is not that difficult, even if you don’t have a sewing machine. Doing it yourself is a lot cheaper than taking them to a tailor.
For a quick fix of course, you can use fusible tape. However, this is not a good permanent solution since the tape eventually comes off after repeated washings.
The following site shows how to determine the correct length for your pants: http://www.squidoo.com/HowToHemAPairOfPants. Another method would be to take a pair of pants that fit you well and use them as a guide. Measure the inseam from the top inside of the leg to the hem.
For a great instructional video and detailed instructions on using hand sewing to hem your pants, check here: http://www.goodhousekeeping.com/product-testing/from-the-lab-blog/easy-way-to-hem-pants.
A couple of other tips: The most important thing to remember if you have to cut off excess material is to measure twice and cut once. You can always make them shorter if need be, but it’s pretty hard to make them longer again.