In order to manually boot into recovery, hold volume up and power, once you see the Motorola logo, count to 3, and then press volume down. If done right you'll see android recovery in the top corner, if not you may see 'starting fastboot protocol,' if so, press volume down again till you see android recovery then press volume up to load CWM recovery. You can also get Quickboot from the market, which makes it so easy to boot into recovery.+1
I'm on a Tiamat ROM and have been wondering the same thing. Do I need to use ADB whenever I need to get into CWM?