If you are in the position to pay extra on your mortgage each month, by all means do it! Every little bit extra applied to your principal balance can make a big difference.
There are several ways to prepay (But first make sure there is not a pre-pay penalty on your mortgage)
SELF-DIRECTED
Add $50-$100 and up to your payment each month, depending on your cash flow situation, and apply it to the principal balance. You need self discipline to do this. Learn the concept of "pay yourself first" and it will benefit you in the long run
SIGN UP FOR A BI-WEEKLY PROGRAM
I got a solicitation in the mail offering "bi-weekly payments to pay off your mortgage faster". Maybe you have received some too. I was curious and checked it out with my loan officer. It is true with a system like this in which you pay every two weeks, you will end up making a whole extra payment over the course of the year. That’s good. But, often these services charge a fee to set you up – sometimes as much as $800.
Both systems work- you just need to decide which is best for you. If you have got a little self discipline, you can pre-pay on your own, save any set-up fee, and have the freedom to decide how much extra to pay each month.