Try a drill using an unloaded and safe weapon and go against another person.
Good advice, Ernst.
Let my share my limited experience with laser aiming devices.
I was sure I wanted to get a pistol w/ laser on it. In early 2000 I was in a group that did training, testing, evaluation for self-defense mostly with pistols, but there was some hand-to-hand and edged weapons thrown in also.
Laser:
I used a borrowed Glock w/ a red laser mounted on it.
In daylight the laser was difficult to see when it was turned on. I had to be pretty close to target to pick it up fast.
The best way to pick it up was to use a standard grip and stance to align the pistol and then "look around it" to find the end of the beam.
By that time I could have used standard sights to fire a shot.
If the laser is illuminating something other that the target is is very hard to find it against items in the background.
When the target is wearing shirts of the wrong color you can't see the dot. Red and black are rough. Patterned shirts are problem.
At night you are giving away your position. [See Ernst above.]
Working in a laser equipped
team was a laugh. In our night exercises we couldn't tell which one of the dots was from which gun. Makes it hard to aim to get a hit unless you figure out which one of four wiggly dots is yours. [I would guess professional training for military and LE addresses that.]
Also I have a religious objection -- The Third Commandment says
"Batteries and Guns Don't Mix!"
For night work I'll stick with standard flashlight techniques.