Get a beard trimmer with a guard, like a Wahl. Trim conservatively the first time to make sure you don't take off more than you want to, and then give yourself a day or so. If you still want to take off more, then lower the setting by one and repeat.

Patience shall be rewarded!

New beard growers: Check out the Rules of Beard Acquisition.
To upload and post pictures, here is a tutorial.
Do you believe in these Common Beard Myths?