If you have a remote or set the timer and put the camera behind a sheet of plexy glass. It houd be fine then.
Now on the picture switch the mode on the camera to M for manual. Set the F-stop to 8 and then set the speed as high as it will go before it starts to blink. I had the same camare so that is what would be best. If you use the pop-up flash it will add more light to bring out the gun and your face more, and it will set the speed even better.
I would say to try to shoot it at 500th a second with the F-stop at 8 would be great. I may try it this weekend if I can get the time. Good luck with that.