Booting into recovery mode is simple, and can be done one of 3 ways.
Simply power down your phone. Once shutdown, hold the Volume Down & Power buttons at the same time. Select recovery from the menu, by using the Volume Down button to move down, and the Power button to select.
With your phone connected to the computer, Open a cmd prompt on your computer. cd into your sdk/tools directory. Type adb reboot recovery
I like Quick Boot for this.