Which ever method you decied to go with try it on the range with live fire. I had been practicing the technique shown in the surefire link, and thuoght I had it down, (I would go through my house at night with an empty pistol). Then I shot an indoor USPSA type match, and one stage was hidden from view (no walk through), and after the LAMR they shut the lights off. The buzzer went off I started shooting, and I learned that my technique sucked, it was hard to keep your grip with the light in your hand, I hit the mag release with the light and ejected the mag twice, and had one jam.
The method I use now I have used in a few matches including USPSA Nationals in 04, and it works something like this.
I hold the flashlight (Surefire Z2 Combat light) in your fist so that you can work the switch with your thumb, now hold your fist in the middle of your chest (fingers aganist your chest), now you can adjust the direction of the beam from the floor up to your target by rotating your wrist. With this method if it is very dark (totaly black) just shining the light down will light up alot, and if the beam is pointed down slightly you don't get blinded from the light reflecting off the back of your gun, and this works pretty good with night sights too. It never hurts to try.
The only thing is you need to be able to shoot weak handed, but you have to that anyway with a flash light unless it's mounted to the gun.