It takes a bit of practice to use a flashlight with a handgun. Most people don't have a tactical light attached to their pistols and if you conceal carry, it's pretty much impossible.
You'll want to watch the video we found about how to properly handle your pistol and flashlight together.
Some things to key in on, make sure you are locking in the light and pistol together as he describes. Also, this is the stuff you want to practice during the day before you need it. Go out to the range, take it it very slow and get the techniques down. Be Safe!
Check out the video and let us know in the comments what you think.